In this video, Mike Augustine demonstrates a fun effect: get a pair of refractive glasses and look at fireworks. His had a heart shape in the refraction, which caused an amazing burst of hearts with each explosion.
You can get them with any kind of refraction. Legoland offers them with a LEGO brick lens:
Here's a manufacturer demonstrating several kinds:
They can be quite nice at a club with your favorite substance and a laser light show, too, just sayin'.
Image: YouTube / Mike Augustine