Lithoscope

This is very, very silly - it's an attachment for phones which have a built in flash and it provides a nice way to show lithophanes, bat type signals and illuminating partially hollow prints.

As such, it should work with a few different brands and models of phones as is, but if you want to try customising it, you can do that from:

http://openjscad.org/#http://pastebin.com/raw.php?i=P921GY7K

As shown in the pictures, I'm attaching mine by two rubber bands, but blutack should also work a