I make Sugarshack's bc icing recipe.....it is a big batch of icing (5 pounds of PS), to flavor it I use......4 tlbs. of Wilton Butter Flavoring & 1 tlb. of French Vanilla Blend Flavoring, these flavorings were got at Wal-Mart.
I sometimes use 1 tlb. of Butava in my cake mixes, my family & friends likes the flavor in the cakes with the icing done in the flavoring combo above.
I have also use Cotton Candy by Lorann ( I think I order it from cakesnthings.com sorry I can't remember ) in some royal icing for some cookies once for my grand daughters birthday party. They tasted pretty good. I havn't tried it in my bc icing yet.
I would like to try these Flavors:
1. Wedding Bouquet Emulsion ( A Flavoring Sugarshack uses, heres a link to that thread..... http://www.cakecentral.com/cake-decorating-ftopict-418353-.html
2. Vanilla Nut Butter Oil ( My sister get this from a cake shop in Lorain, Ohio called Mary's Sweet Shop.