Minecraft wiki entry for Shelters, associated text: You can spice up your base by adding a carpet made out of colored wool. Make sure that fire and lava aren't within two blocks from the carpet, otherwise your carpet will go up in flames! Bright colors, like red, blue and purple are recommended, because black and gray carpets don't have the same feel. Try mixing colors together in cool patterns if you're looking to give a room a bit of flair. With the new carpets added in snapshot 13w16a, you can carpet the upper floors of your base without having your lower floors' ceiling made of wool.