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 as should printing specific wrap around clamps (might get round to the latter at some point for my Galaxy S3).

The whole thing is work in progress, and I hope to add a means to allow the lithophane/other objects to be held on to the lithoscope when the phone is held vertically.

... although it works really well, the curious thing is that I can't take a picture of it illuminating a lithophane :) - all I get is a bright glow in the other cameras I've tried so far.

Prints without support. Suggest that it's printed in black, but can be painted if necessary I guess.