I was going to suggest one of the foodstores that have bakeries in them. Redner's does make nice cakes. I work at Giant part time, but their artwork at the one I'm at does NOT thrill me.

I used to bake and decorate cakes from when I about 14yrs old. The AC Moore stores and Michael's have the tins that you need for them. If you do one, even the basic "star" tip can make a nice cake for a Minnie Mouse. I did see that in one or two of the pics above. They used the star tip and just different colors. If you can get a nice stiff icing, you can do the stars and they'll stay set up really well. You could always give it a try, lol. I'd just buy a metal star tip (not plastic), you can get the bags and the inserts for the tips pretty easily (the tip should go in a coupler to stay secure). If you make the cake, find the spray that they have that is butter and flour in a can, especially for cake pans, so that it won't stick.