Minecraft wiki entry for Creating_a_challenge_map, associated text: When you finally finish the map, you can create a fireworks show for celebration. Hook up redstone to some dispensers, craft up some fireworks, and then let them fly! Alternatively, you could just add some diamond dispensers. Either way will look amazing, and are great ways to celebrate the completion of a challenge map. If you don't want to use dispensers, use command blocks to spawn fireworks.