Maybe try looking at Jennie Doan's tutorials and patterns for some ideas. Her website is Missouri Star Quilt Company, which you may already know. She does a lot with precuts and since your squares are similar in size to charm packs, 5", you might find something you can use. Maybe just add some yardage with your squares. One I'm thinking of is called Falling Charms, I think. I'm with you, I need a pattern for sure, at the very least just to get started. Good Luck and let us know what you find.
Just wanted to add that most charm packs have about 40 squares, so you have close to one charm pack to work with.