Congrats on the new Beardie, I am a new owner myself. Not sure if this is the types of backgrounds you were looking for or not but in my opinion they rock.....
http://www.bigappleherp.com/REPTILE-SUPPLIES/Backgrounds have many to choose from along with rock kits from the same manufacturer, prices are high along with shipping, but they do carry a nice selection. Universal rocks is the manufacture so you might want to try to contact them direct. I have used their products and find them to look extremely real and also be durable......
http://www.universalrocks.com/
I am editing in some more information on the products so people will be aware before purchasing.
The product is great but in some circumstances you may have to customize, meaning cutting to fit. Not all tanks are the same dimensions so shims or cutting may be required. To secure background in place I either use screws if to wood, or glue magnets much in the way mag-natural pieces work, you could also silicone directly to glass. I find that siliconing the entire perimeter is the best way to keep insects from hiding behind the background. The backs of these things are not flat but rather semi textured much like the fronts.
The rock kits are awesome but were not designed for flat bare bottom displays, so if you do not have sand but rather tile or something else like that then you many have to trim flat and silicone the rocks in place, they are also extremely light.
In my opinion this is a great company with great products, they originally designed these things for fish tanks but due to interest from the herp community they began to spray the backs with foam and offer us some options. In closing awesome product but you might have to do some work with them rather than just drop in place.
http://www.universalrocks.com/Universal-Rocks-Aquarium-Reptile-Brochure-%20March-2011-w.pdf
