I used cut up Jeans to make slippers last Christmas, for all the kids in the family. They turned out brilliantly. I also used them to make handbags for all the grownup ladies! They were well recieved and everyone loved them. I am sure other people could give you other ideas on how to use Jeans material.
I can't give you advice on rag quilts, because I have never made one - I don't really like the look of them! However, I must admit that the ones shown here look fantastic! I am sure that whoever you make them for, will be delighted.