Minecraft Scene with Cycles

Hi! Im trying to make a minecraft scene with cycles. But the textures are interpolated if that is a word ;). I dont want to remap all my textures to make the textures bigger. I will do some easy to understand compositing though. I will have my blend file included. https://www.dropbox.com/s/qp1rh2ufjunbgjb/test%20world.blend