Minecraft Concepts

I just thought of one more - Paintable-side wool blocks. Using a dye on a wool block placed in the world would change the color of the side you used the dye on. This would work great on signs and buildings, inside and out. To change the whole block at once, place wool and a dye to a crafting interface. We can already paint wolf collars, dye leatherand have biome-specific color on foliage. It wouldn't take hundreds of thousands of textures either - just 6 such textures for each side.