In a sudden change of plans the team over at Mojang have pushed back their 1.5 Redstone update to make way for--fireworks!

The new update is currently in progress, but you can pick up the snapshot version over at the Mojang site and get an early taste of it.

Even more fun, you can add a few modifiers to the recipie, causing it to twinkle upon exploding or explode in the shape of a creeper face.