Most of my quilts are hung on the wall with a board in a sleeve at the top. Nails or screws fit thru a hole at each end of the board. The quilt hangs flat against the wall. If it's wider that 3', I usually have a stiffener board at the bottom in a sleeve as well. This keeps the quilt flat and it doesn't ripple.
Quilts I made for my sons', hang on curtain rods they mounted to the wall. A sleeve at the top slides onto the rod, so the quilt hangs out from the wall a few inches.