HOW TO HANG A CROCHET OR KNIT AFGHAN ON THE WALL
Lay the felt down and center the afghan. Either hand baste it to the felt (from the center out to prevent shifting and bubbles) or use a quilt baster - you can order them in colors other than red.
When it's secure, carefully trim the sides of the felt so they can't be seen from the front. Turn the piece over and fold the top and bottom of the felt down and pin to form casings (you can cut the extra off). Carefully make your casing by hand with a running stitch (D is the measurement around the curtain rod).
Then use a curtain rod to hang the piece, and put one in the bottom casing for weight, or use a length of chain or a beaded weight.