I found this list of flavors and what they pair well with. Hope some find it useful in your e-juice DIY'ing. 
(Granted some of these I have not seen used in e-juice, but I did not edit it because you never know...lol.)
Almond pairs well with:
apple, apricot, banana, caramel, cherry, coffee, fig, honey, orange, peach, pear, plum
Apple pairs well with:
caramel, cardamom, chestnut, cinnamon, cranberry, currant, ginger, hazelnut, mango, maple, rosemary, walnut
Apricot pairs well with:
almond, black pepper, caramel, cardamom, ginger, hazelnut, honey, orange, peach, vanilla, plum, Sauternes, wine
Asian Pear pairs well with:
almond, apple, black pepper, cinnamon, ginger, honey, macadamia, nutmeg, raisin, vanilla
Banana pairs well with:
brandy, caramel, cherry, chocolate, cinnamon, coffee, dark rum, ginger, hazelnut, honey, Madeira wine, mango, molasses, papaya
Blackberry pairs well with:
apricot, black pepper, champagne, cinnamon, citrus, hazelnut, lemon, other berries, peach, plum, Port wine
Blood Orange pairs well with:
almond, cardamom, chocolate, cinnamon, clove, fig, ginger, honey, other citrus
Blueberry pairs well with:
lemon verbena, other berries, cardamom, mango, lemon, hazelnut, ginger, fig, lavender, other citrus,
Carrot pairs well with:
anise, brandy, cinnamon, ginger, nutmeg, walnut
Cherry pairs well with:
apricot, black pepper, chocolate, citrus, nectarine, peach, plum, Port wine, vanilla
Chestnut pairs well with:
apple, caramel, chocolate, coffee, pear, vanilla
Cilantro (coriander) pairs well with:
apricot, berries, cherries, citrus, nectarine, peach, plum, tropical fruit
Coconut pairs well with:
banana, Brazil nut, caramel, chocolate, citrus, Kaffir leaf, lemongrass, pineapple, other tropical fruits
Cranberry pairs well with:
apple, chocolate, cinnamon, citrus, mango, mint, pear
Currants, Black and Red, pairs well with:
cassis, chocolate, citrus, dark rum, Port wine, sloe gin
Elderberry pairs well with:
apricot, fig, honey, lemon, mandarin, other berries, peach, plum
Feijoa pairs well with:
banana, berries, cinnamon, citrus, mango, vanilla
Fig pairs well with:
almond, black pepper, cinnamon, citrus, hazelnut, pear, Port wine, vanilla
Ginger pairs well with:
almond, apple, apricot, banana, berries, Brazil nut, caramel, chocolate, citrus, coconut, grape, hazelnut, passion fruit, peach, pear, pineaple, plum, tropical fruit
Gooseberry pairs well with:
citrus, hazelnut, honey, other berries, white chocolate
Grape pairs well with:
brandy, chocolate, citrus, ginger, raisin
Grapefruit pairs well with:
basil, black pepper, caramel, citrus, mint, rosemary, thyme, tropical fruit, vanilla
Guava pairs well with:
citrus, coconut, huckleberry, kaffir leaf, pineapple, strawberry, tropical fruit
Hazelnut pairs well with:
apple, apricot, banana, berries, caramel, cherry, chocolate, citrus, fig, mandarin, peach, pear, plum
Kaffir Leaf pairs well with:
banana, citrus, coconut, lemongrass, tropical fruit, watermelon
Kiwi pairs well with:
apple, banana, berries, cherry, citrus, coconut, mango, tropical fruit
Kumquat pairs well with:
berries, cherry, chocolate, cinnamon, coffee, persimmon, plum
Lemon pairs well with:
apricot, berries, black pepper, cardamom, cherry, citrus, ginger, nectarine, peach, plum, prickly pear, tropical fruit
Lemongrass pairs well with:
cherry, berries, citrus, coconut, ginger ,guava, kaffir leaf, coconut, tropical fruit, vanilla
Lime pairs well with:
apple, berries, cherry, ginger, papaya, plum, strawberry, tropical fruit
Lychee pairs well with:
citrus, ginger, gooseberry, tropical fruit, vanilla
Mandarin pairs well with:
cardamom, cherry, chocolate, cinnamon, coffee, fig, ginger, nutmeg, tropical fruits, vanilla, star anise
Mango pairs well with:
apple, banana, berries, caramel, citrus, coconut, melon, Sauternes, tropical fruits, vanilla
Melon pairs well with:
berries, champagne, citrus, lemongrass, lemon verbena
Orange pairs well with:
almonds, basil, berries, brandy, cherry, chocolate, cilantro, cinnamon, coffee, cranberry, fig, ginger, grape, hazelnut, mint, nutmeg, persimmon, pineapple, vanilla
Papaya pairs well with:
citrus, black pepper, lime, mango, tropical fruit
Peach pairs well with:
almond, apricot, blackberry, brandy, cherry, cilantro, cinnamon, elderberry, ginger, hazelnut, lemon, raspberry, rhubarb, walnut, watermelon
Pear pairs well with:
almond, apple, caramel, chestnut, chocolate, cinnamon, citrus, ginger, hazelnut, Port wine, vanilla, walnut, anise, blackberry, brandy
Persimmon pairs well with:
apple, black pepper, cinnamon, citrus, kumquat, pear
Pineapple pairs well with:
basil, caramel, cilantro, coconut, macadamia, rosemary, rum, tropical fruit
Plum pairs well with:
almond, cinnamon, citrus, chestnut, black pepper, hazelnut, honey, Port wine, vanilla
Pomegranate pairs well with:
apple, citrus, cucumber, mint, tropical fruit
Prickly Pear pairs well with:
citrus, lime, tomatillo, tropical fruit
Raspberry pairs well with:
apricot, cinnamon, citrus, ginger, lemon, nectarine, other berries, peach, plum, rhubarb, thyme, vanilla
Rhubarb pairs well with:
apple, apricot, berries, black pepper, citrus, ginger, nectarine, peach, plum, strawberry
Strawberry pairs well with:
apple, black pepper, chocolate, citrus, coriander, mint, rhubarb, vanilla
Tomatillo pairs well with:
berries, citrus, mango, prickly pear, tropical fruit
Walnut pairs well with:
apple, apricot, banana, caramel, chocolate, cinnamon, nectarine, peach, pear, plum, rum
I'm sure there are many MANY more/others...
share yours.
ETA:
To add to the list of flavor pairing ideas...these items can be "flavor enhancers" with just about anything.
Nuts can enhance the aroma, taste...and perceptual texture. (pecans, walnuts, peanuts, etc)
Vanilla, Cinnamon, or Nutmeg can enhance sweet flavors.
(Granted some of these I have not seen used in e-juice, but I did not edit it because you never know...lol.)
Almond pairs well with:
apple, apricot, banana, caramel, cherry, coffee, fig, honey, orange, peach, pear, plum
Apple pairs well with:
caramel, cardamom, chestnut, cinnamon, cranberry, currant, ginger, hazelnut, mango, maple, rosemary, walnut
Apricot pairs well with:
almond, black pepper, caramel, cardamom, ginger, hazelnut, honey, orange, peach, vanilla, plum, Sauternes, wine
Asian Pear pairs well with:
almond, apple, black pepper, cinnamon, ginger, honey, macadamia, nutmeg, raisin, vanilla
Banana pairs well with:
brandy, caramel, cherry, chocolate, cinnamon, coffee, dark rum, ginger, hazelnut, honey, Madeira wine, mango, molasses, papaya
Blackberry pairs well with:
apricot, black pepper, champagne, cinnamon, citrus, hazelnut, lemon, other berries, peach, plum, Port wine
Blood Orange pairs well with:
almond, cardamom, chocolate, cinnamon, clove, fig, ginger, honey, other citrus
Blueberry pairs well with:
lemon verbena, other berries, cardamom, mango, lemon, hazelnut, ginger, fig, lavender, other citrus,
Carrot pairs well with:
anise, brandy, cinnamon, ginger, nutmeg, walnut
Cherry pairs well with:
apricot, black pepper, chocolate, citrus, nectarine, peach, plum, Port wine, vanilla
Chestnut pairs well with:
apple, caramel, chocolate, coffee, pear, vanilla
Cilantro (coriander) pairs well with:
apricot, berries, cherries, citrus, nectarine, peach, plum, tropical fruit
Coconut pairs well with:
banana, Brazil nut, caramel, chocolate, citrus, Kaffir leaf, lemongrass, pineapple, other tropical fruits
Cranberry pairs well with:
apple, chocolate, cinnamon, citrus, mango, mint, pear
Currants, Black and Red, pairs well with:
cassis, chocolate, citrus, dark rum, Port wine, sloe gin
Elderberry pairs well with:
apricot, fig, honey, lemon, mandarin, other berries, peach, plum
Feijoa pairs well with:
banana, berries, cinnamon, citrus, mango, vanilla
Fig pairs well with:
almond, black pepper, cinnamon, citrus, hazelnut, pear, Port wine, vanilla
Ginger pairs well with:
almond, apple, apricot, banana, berries, Brazil nut, caramel, chocolate, citrus, coconut, grape, hazelnut, passion fruit, peach, pear, pineaple, plum, tropical fruit
Gooseberry pairs well with:
citrus, hazelnut, honey, other berries, white chocolate
Grape pairs well with:
brandy, chocolate, citrus, ginger, raisin
Grapefruit pairs well with:
basil, black pepper, caramel, citrus, mint, rosemary, thyme, tropical fruit, vanilla
Guava pairs well with:
citrus, coconut, huckleberry, kaffir leaf, pineapple, strawberry, tropical fruit
Hazelnut pairs well with:
apple, apricot, banana, berries, caramel, cherry, chocolate, citrus, fig, mandarin, peach, pear, plum
Kaffir Leaf pairs well with:
banana, citrus, coconut, lemongrass, tropical fruit, watermelon
Kiwi pairs well with:
apple, banana, berries, cherry, citrus, coconut, mango, tropical fruit
Kumquat pairs well with:
berries, cherry, chocolate, cinnamon, coffee, persimmon, plum
Lemon pairs well with:
apricot, berries, black pepper, cardamom, cherry, citrus, ginger, nectarine, peach, plum, prickly pear, tropical fruit
Lemongrass pairs well with:
cherry, berries, citrus, coconut, ginger ,guava, kaffir leaf, coconut, tropical fruit, vanilla
Lime pairs well with:
apple, berries, cherry, ginger, papaya, plum, strawberry, tropical fruit
Lychee pairs well with:
citrus, ginger, gooseberry, tropical fruit, vanilla
Mandarin pairs well with:
cardamom, cherry, chocolate, cinnamon, coffee, fig, ginger, nutmeg, tropical fruits, vanilla, star anise
Mango pairs well with:
apple, banana, berries, caramel, citrus, coconut, melon, Sauternes, tropical fruits, vanilla
Melon pairs well with:
berries, champagne, citrus, lemongrass, lemon verbena
Orange pairs well with:
almonds, basil, berries, brandy, cherry, chocolate, cilantro, cinnamon, coffee, cranberry, fig, ginger, grape, hazelnut, mint, nutmeg, persimmon, pineapple, vanilla
Papaya pairs well with:
citrus, black pepper, lime, mango, tropical fruit
Peach pairs well with:
almond, apricot, blackberry, brandy, cherry, cilantro, cinnamon, elderberry, ginger, hazelnut, lemon, raspberry, rhubarb, walnut, watermelon
Pear pairs well with:
almond, apple, caramel, chestnut, chocolate, cinnamon, citrus, ginger, hazelnut, Port wine, vanilla, walnut, anise, blackberry, brandy
Persimmon pairs well with:
apple, black pepper, cinnamon, citrus, kumquat, pear
Pineapple pairs well with:
basil, caramel, cilantro, coconut, macadamia, rosemary, rum, tropical fruit
Plum pairs well with:
almond, cinnamon, citrus, chestnut, black pepper, hazelnut, honey, Port wine, vanilla
Pomegranate pairs well with:
apple, citrus, cucumber, mint, tropical fruit
Prickly Pear pairs well with:
citrus, lime, tomatillo, tropical fruit
Raspberry pairs well with:
apricot, cinnamon, citrus, ginger, lemon, nectarine, other berries, peach, plum, rhubarb, thyme, vanilla
Rhubarb pairs well with:
apple, apricot, berries, black pepper, citrus, ginger, nectarine, peach, plum, strawberry
Strawberry pairs well with:
apple, black pepper, chocolate, citrus, coriander, mint, rhubarb, vanilla
Tomatillo pairs well with:
berries, citrus, mango, prickly pear, tropical fruit
Walnut pairs well with:
apple, apricot, banana, caramel, chocolate, cinnamon, nectarine, peach, pear, plum, rum
I'm sure there are many MANY more/others...
share yours.
ETA:
To add to the list of flavor pairing ideas...these items can be "flavor enhancers" with just about anything.
Nuts can enhance the aroma, taste...and perceptual texture. (pecans, walnuts, peanuts, etc)
Vanilla, Cinnamon, or Nutmeg can enhance sweet flavors.
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