MakeAZombie let you do just that, create and design a zombie. You are given a cartoonish looking zombie that you choose which hair, eyes, mouth, clothes and more to dress him up. It's a pretty simple app and I don't really know what you would with the zombie after you made it but little kids seem to like it. The app is free but there are in app purchases. For $.99 you can remove the ads and had a pack that offers more zombie parts. There are five pack or for $3.99 you can buy all the packs. The app works fine and can be fun for a few minutes but I don't see spending money on this app.
Free in iTunes Store