Maureen,
I am in a fickle about this myself. 6 months into vaping and I've hit that point where I need to shake things up a bit. Here's the rub, I'm not much into sweets and I don't care much for coffee flavors. I go to pick juices and I feel like I'm looking at a copy of Dessert Monthly! Ugh!
Maybe the reason for this is because most of these flavors have been used in baking and candies for years. It takes flavorists a long time to perfect these flavors chemically I imagine and before e-juice I don't think there's been a market. This is purely a guess.
Right now I am vaping a half and half mix of 555 and Key Lime. It's nice, a bit tart, which I often perceive as salty. I would really love to hear what others have come up with!