Wow. This brings up lots of ideas well beyond the realm of what I can do. If you are good with fondant, gumpast, and sculpting, what about a studio with the wood flooring and a bar and a ballerina with a leg up on the bar and another ballerina twirling? Or some kind of Swan Lake theme with a ballerina dancing around a swan?
I saw some of your beautiful Barbie cakes in your photos! 
What if you made a Barbie cake kind of like that with the wondermold. But instead of making a long dress, you made a tutu from fondant and made the legs from fondant along the wondermold in a ballerina position ( I don't know them but I've heard of 1st position, 5th position etc.). Or maybe you could make a large round cake with the 6 in. round on top to have the depth to stick the doll in and use the 6 in. to make the tutu all frilly on, and then make it so she is like doing the splits with the fondant legs extended out on the bottom cake? I wish I could do drawings on here; sorry-I'm too mokey pawed w/ the computer 
Very cute! My little ballerina would love this!
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