I'm not sure if I will ever want to do something like that, it gives you interesting abstract pictures, but also a very dirty sensor, but if you have a film camera (where there is no such problem as dust on the sensor) or and old DSRL that you don't use it anymore, why not? Anyway, this is an interesting tutorial by Rob Turney, who is going to introduce you to the art of Refractography, and you can see some of his creations by clicking here.

(via ISO1200)