Does anyone have a recipe for a chocolate frosting that is a good consistency for decorating and doesn't taste super rich? I'd prefer one that doesn't require real butter. ('') (I know, I know, butter works the best, but I have more of a margarine or shortening family.)

I make the Wilton chocolate buttercream but only use butter flavored crisco...no butter or margarine....and I go a little light on the cocoa powder.