Look thru your packs and see if you can find a couple that 'play well' together for a larger quilt.
I like shadow quilts:
https://www.youtube.com/watch?v=qBSZ...VFDHmDXqCIzuAw
you can make the shadows larger or smaller to adjust the size of the quilt. You just need 2 additional fabrics, the same color, just make sure they have good contrast. You can also look into any of Pat Speth's Nickle Quilt books, where she uses charm packs.