Go to
http://www.missouriquiltco.com and check out some of their videos for using charm packs. One I remember that was especially nice was a Jacob's Ladder. Or put them together in coordinating pairs, right sides together, and sew around the outsides with a 1/4" seam. Then cut them diagonally both directions. You can use the results to make pinwheels or hourglasses or turn the darks to the inside, or the lights to the inside... or several other patterns. I love charm packs. And Irishrose is right, a tumbler quilt would be an economical use of charm packs. Enjoy them!