I am looking for a way, app, or service to make IOS and Android buttons.

I have looked at quite a few graphics apps from Gimp all the way to PhotoShop and want something that I can define a theme, and then tell it how many buttons I want, what text I want on them, and how big to make them, and have it create both the up and down state buttons.

Is there an app or service that does this?

Thanks!