Minecraft Block compatible with popular bricks

This is a block/brick that is compatible with popular brick-based toys and has a 16x16 pixel grid on all but the bottom face that can be painted in by hand. The nubs on top are 4x4 and is compatible both ways. I thought it might be fun to make bigger terrain sets for tableaus and then add commercial ones on top. I'll update it as I add more textures and finish a project. So far I've added Grass, Sand, Stone and Redstone Ore blocks. EDIT: I've added Sand, Stone and Redstone Ore in the latest update.