I was also wondering what was on the back of the cage?? It looks very nice. I am always looking for new things to keep humidity up in my cham's cage and I think putting up one panel of whatever you have in the back would be great.
The camera is a Fujifilm s3000 3.2MP
Backdrop is my LCD monitor turned off
the backdrop in my cage i got when i purchased the terrarrium, its made from styrafoam. You can buy them from the Exo-terra website, they look like real stone and the chameleon likes to clime up it and occasonally sleeps on it http://www.exo-terra.com/EN/products/background_i.html