Thank you for all the suggestions. Making my own sounds like a great way to save money (which I really need to do) but since I've never even used one of these and I have no idea at all how they even work (lamps? glass? lasagna dishes, table leafs?) I'm probably going to be better off buying one and hoping it comes with good directions.
Are any of them made specifically for fabric or are any many in such a way that they shouldn't be used for fabric?
Thx