72" is a little short for a twin, but they might not have a proper bed quilt in mind. I always assume kid quilts are going to get carried around by the child, and so you want something small enough that they don't have to literally drag it. That might be what the camp people are considering in their size requests since the kids will be taking them home.
As for pattern recs, you can get a lot of punch out of some well contrasted half-square triangles. 4" squares set 13x18 would get you to 52"x72"
I also fall back on this Villa Rosa
pattern pretty often. It uses fat quarters. You'd need one more row and a boarder to get to the right size, though, so it might be more work than you want.
