Minecraft wiki entry for Pixel_art, associated text: Blocks can be rather difficult to make with pixel art, because of the fact that some blocks use many different colors for each pixel, but they are all similar. The reason this makes the pixel art difficult is that there may not be enough wool or concrete colors to simulate every pixel. If this happens, you can either try to figure out what colored block simulates each pixel the closest, or use blocks that are not wool, concrete, or terracotta. Blocks that are not these colors usually have many different colors within themselves, but from a distance, it looks equal.