Can anyone think of a reason why faux or natural stone veneer used for siding or interior decorating projects wouldn't be a perfect aquarium background? You would be able to simulate dozens if not hundreds of different looks and would not have to deal with the weight of real rock. This is just an example of any number of web sites selling this material.
http://www.culturedstone.com/
The field stone look awesome.
http://www.culturedstone.com/
The field stone look awesome.