As far as texturing a 3D object goes, there are 'top' and 'side' textures included for each biome type, divided into individual folders. Each texture is a 16x16 graphic that is scaled up to 64x64 (You can actually use a pixelation or mosaic filter to duplicate this effect) GIMP has a filter under Blur -> Pixelize that works quite well if you set the Block Width and Block Height to 8, and use it on an existing image or texture! Most of these textures were made using gradients in combination with a pixelation filter, though some (like the bricks) had a few more steps involved before applying the pixelation