My daughter collected fat quarters on our various roadtrips across Canada, she was only 9 when she started! She made sure to get food that she liked (hmmmm no veggies in there?).
She hasn't finished her quilt yet (she is 13 now) but she's accomplished a lot. Attached is a picture of it on the design wall. Her name is Lisa so it was easy for her to convert to blocks. She cut all her blocks at 6 inches.