I love to make rag quilts and there are so many patterns you can use. Try this link:
http://quilting.about.com/od/quiltpa.../rag_quilt.htm
You can also google rag quilt patterns.
Do not wash your fabric first. You will wash it after you have sewn it and snipped it. Then the fabric will fray nicely. If you have denim and flannel, you don't necessarily need batting. It just depends on how warm you want the quilt. (Lots of variables and I have done it both ways.) Have fun and good luck!
My first rag quilt
[ATTACH=CONFIG]52977[/ATTACH]