Deco is short for Decoration. It's all about decorating everyday objects, from a DS case to a pill box.
There are several different types of deco, but I'll be focusing on Sweets deco.
Sweet deco focuses on well, sweets. This type of deco usually consists of jewelry that's made to look like food and desserts.
There are many japanese pro stores that offer this kind of deco.
Chocomint sells Ribbon Holic and various lolita accessories and the best part is they offer international shipping!