Besides covering cakes and cookies.
Rolled buttercream is yummy. If I have leftover, ball it up and pop it in your mouth!
Seriously, you could cover cupcakes with it? I haven't tried to use it for "molding" but I wonder...say those little plastic chocolate molds? What if you tried to mold with RBC instead? I've used RBC for cake covering since some people just don't like MMF. RBC is delish, but a bit of a pain to work with.