What about the Beads pattern by Jordan Fabrics? It uses 5in squares and 2.5in squares which would work with your charm packs and jelly roll. It could easily be done with a gray background to pair with your Stitch fabrics to really make them pop so you wouldn't be concerned about pets on it.
It's easy to size the pattern up or down as well so it just depends on your charms+strips. You can always add additional other fabrics if you don't have enough matches.
https://jordanfabrics.com/pages/beads