There are tons of videos about paint pouring on YouTube that are fun to watch, with dozens of different techniques. I like how you can use a hair dryer to A) chase paint across the canvas and B) cause cells of different colors to bloom.

In addition to plain paintings I have seen:
* series of 2-4 canvases used as a set
* magnets, coasters, and other small decor
* earrings, bracelets, and other jewelry
* cheese boards
* a lazy Susan that we bought.