From the book Photocraft: Cool Things to Do with the Pictures You Love: Scan or crop your images to the size of a CD case (5 3/8 in. wide by 4 5/8 in. high) then print on good photopaper and trim. We recommend using standard (not slim) cases. Discard plastic inserts.
Back each photo with cardboard or foam board and snap the cases shut. Attach them to the wall with 3-inch strips of sticky-back hood-and-loop fasteners (such as Velcro).