Mini quilts aren't very heavy and generally don't need a lot of support to hang on a wall. If you're looking for an alternative to a quilt sleeve or quilt corner triangles and dowels, then a hoop and a thumbtack is another option. Calamity Kim told me how she likes to hang up her quilts by sewing on a soda can tab. I've done this in the past but I wanted a fancier look for my lastest doll quilt. The answer is a little hoop with macrame knots on it to match the quilt back. Thumbtacks or small nails in the wall are all that is then needed to hang your mini quilt on the wall.
Supplies are simple - DMC embroidery floss and size 13mm hoops or jump rings. I couldn't find them the other day so I used hoop earrings instead:
Cut a piece of floss about 25" or so then separate it into 3 strands. Keep a 4-5" tail and start knotting around the hoop:
Continue knotting around the hoop until you've reached the beginning knot. Keep the tails long and use them to sew the loop onto your quilt back.
When you use matching embroidery floss it makes a very nice unobtrusive hanger.