Hello, andto BP.net...
Yes, tissue boxes can work, but keep in mind that every time they get urine or feces on them, they will have to be replaced. Some cheap alternatives are to get a couple of plastic flower pots or plastic bowls from Wal-Mart, Target or your local Dollar store and cut or melt some entry holes. These will last alot longer and are easy to clean.
You should also have 2 identical hides. One on the cool end and one one the warm end. Here is a thread with photos of the flower pot and bowl...
http://ball-pythons.net/forums/showt...0-Hides-my-way