I would suggest haunting thrift stores, Goodwill and Salvation Army and garage sales for large scale print blouses or skirts and Men's hawiian shirts, etc. Rather than 30 FQ they could use maybe 15 fabrics repeated. They could come up with a very unique and beautiful quilt with the added fun of finding the fabrics, like a scavenger hunt. Additionally, they could easily cut up the left over fabrics into FQ and sell bundles at the fair. Make sure they match like fabric contents so their bundles are all cotton or notated if there is rayon, silk, polyester a blend or another fiber. At my fair the 4H always has a little gift shop area set up for selling items.