I hand-sewed a backing on a "crazy quilt" throw I made. I brought the backing around to the front for about an inch, tucked so it wasn't the cut edge (like the edgings on some blankets you buy) and I like that look. I think, unless it's very small, it should be joined at intervals through the whole thing. Unfortunately, I don't know how, and would also love some advice. I know I should put a stitch at the corner of each square, but what stitch?
Sorry my description's not very good. I'm sure someone on the board will give you a better answer.