DIY Kaleidoscope
This one could fit under "do try this at home".
A few weeks ago, my father bought some longish, square metal poles for some DIY around the house. At the hardware store, I noticed that these made quite a good "DIY kaleidoscope":
Here is what the pipe looks like:
The photos themselves aren't really very good, but it was an interesting little experiment just to see if I could get an interesting photo that way. Next time, I think I'll try a camera that gives me a bit more manual control than the little point-and-shoot Nikon Coolpix I used for this.
The other problem I will have to overcome is one of wobble: as I was holding the camera with one hand, and the metal tube with the other, both were wobbling and in different directions and to different extents. This made it a bit harder to get a steady photograph...