Like most I am sure you have purchased hides and cave$$$ that your herp outgrows. I found this page and have made several of these with no issues and they look/work great. They always look different so no duplicates in diff cages. People have voiced concerns about fumes but as long as you stick to hot glue guns, water based paints/sealers and sanded water based grouts you will have no "fumes" or chemicals issues. In fact many wild life places like zoos and the like build habitats or have them built with similar materials. I will post a pic or two of my best thus far is you all are interested.
http://www.instructables.com/id/Make...r-a-reptile-c/
Let me know what you think.
Neil