I use the plastic plant saucers that look like terra cotta but are obviously plastic. Cheap, come in several sizes, and don't look bad as an inexpensive hide. The snakes seem to like them as well, they supposedly feel more secure with a low ceiling and when they can touch the sides. Just use scissors to cut a door in the side.
The actual clay pot saucers would work as well , I imagine, but it's a lot more work getting a safe hole cut in them.