If you care more about the way your iOS keyboard looks than how it works, CooolKey is a great choice for you.
Not only can you pick from tons of stock keyboards ( e.g. games, celebrities, abstract) you can also create your own. Choose an existing background or add a photo, pick your key style and font, and select the key animation and sounds. However there is no autocorrect or predictive text so it takes longer to type and is less accurate.
CooolKey is a great concept but it needs improvement.