Substance Designer is a visual texture creation tool which is currently 66% off on Steam, selling for 33.99$. It’s a flash sale and only 2 1/2 hours to go, so you might want to act quick.
Substance 4 integrates with most 3D modelling applications including Max, Maya, Modo as well as engines such as Unity and UDK. Of course you can generate a texture in SD4 and use it in any application.
Think it may be a late Christmas gift for myself.