This list was pulled from the TFA flavoring thread in the DIY liquid section. Wanted to save it somewhere for future reference. Flavors in bold are flavors I own or have tried.
Absinthe: 10%
Almond Amaretto: 5-10%
Apple: 20% + 1% Sweetener
Banana Cream 10%-15%
Banana Nut Bread: 5-7%
Bavarian...