Minecraft wiki entry for Furniture, associated text: Using lava as lighting can create a cool effect. Place a non-flammable block on the ground. Place a block next to that, and place glass on there, before removing the second block you placed. Do this on all sides, before placing any amount of layers of glass on top of the glass. Pour lava down the resulting tube, and place a non-flammable block on the top. Another way (This is best for dungeons) is to place lava and put iron bars in front of the lava (This may not work in 1.13 because of updated water physics). Note: This is dangerous if anything within four blocks of your lava lamp is flammable. Not recommended for houses with lots of wood/wool.