LightField is producing a nifty range of 12 gauge, 20 gauge and .410 shotgun blanks called the Zombie Blaster. They do not contain a projectile and are simply designed to make as much noise and as big a flash as possible.

Zombie Blaster in action.

These rounds are just for fun, but the company does manufacture a law enforcement equivalent called the Nova Distraction Round which they promote as a cheaper alternative to Flash Bangs.