Last night I built a box for a couple of corn snakes I will be getting soon. I built it out of 1/2" plywood and used 3" flexwatt with a dimmer switch spliced into the power cord. It isn't quite finished yet, but I think you get the idea.

Click on the thumbnails for larger images.

This is the front:


This is the back:


Flexwatt inside:


Wiring of the dimmer