This is the pattern I used.
http://www.kquilts-studio.com/pincus...her_tutori.htm
I did a quilt block pattern on it and put a 4 inch tile inside of the bottom of mine and stuffed the top with wool. I find it really handy to have and when I move it (afraid I will knock it off when machine quilting) I find myself throwing the threads on the floor without realizing it.