Riley Blake Designs -- Cutting Corners: Zoo Dwellers Quilt Tutorial Might work for some of those pre-printed panels http://www.rileyblakedesigns.com/cutting-corners/2011/08/30/zoo-dwellers-quilt-tutorial/#
What a cute idea! You could use this idea in several ways. For instance as your child grows you can take pieces of the favorite outifts and recreate them on the quilt. Could be easily modified for little boys too....instead of skirts just make a pant. Oh! the possibilites!