Like Jason said, some fake plants from walmart or something would make your snake feel safer and be more active and interesting for you to watch, and the rocks don't need to take up that much of the tank. Paper towel or a substrate like reptibark, aspen, or carefresh would be better. The paper towels are certainly easier to clean, but some snakes enjoy burrowing, which is easier with the other substrates.

Quote Originally Posted by kibakiba View Post
You want to be careful about piling rocks up. It can crush your snake.
Gorilla Glue If you let it set properly, you should be able to make small structures that you can't even break apart yourself. Just make sure they've set well and can't be torn apart at all when you put them into the enclosure.