for anyone who wants to know how to make a patchwork circle skirt, head over to Just Tutes, thats where i got my info. She has a great tutorial for a dress with a patchwork skirt, and explains the math behind how it works out. She also has tons of other fun clothing tutorials for kids, its definitely worth looking if you want to make this or something fun for a little girl.
I also reccomend Craftster, do a search there, some other ladies have made some really cool circle skirts, i think one got her idea from justtutes as well. Seeing that another adult had tried this and survived, and that it looks really cool when finished, made it a whole lot easier to start, but a childs size should be alot faster that mine.