Copyright info for painting-textures:

Images used in "kz.png" (Minecraft paintings) are made and belongs to Kristoffer Zetterstrand. 
Kristoffer Zetterstrand is represented by Peter Bergman gallery. 
These are original images that the Mojang team uses for their default paintings.
These images are protected with Creative Commons.

Kristoffer Zetterstrand's official homepage: http://zetterstrand.com/