everytime I decorate cakes with buttercream and make decorations the buttercream is too sweet. so eating this is like eating a pound of sugar. any recipes for less sweet buttercream?

Have you tried Swiss Meringue Buttercream or Italian Meringue Buttercream? They don't use powdered sugar. They just use granulated sugar - and a very small amount compared to a normal buttercream recipe.

Here's my favorite recipe.

http://cakecentral.com/recipes/5453/the-well-dressed-cake-swiss-meringue-buttercream-with-variations