You can use whatever you want. I've seen quilts made out of whacked up old coats, jeans, men's suits, wool, corduroy, men's silk ties, etc. I would at least try to keep the weight of the fabrics the same in one top. I would also wash all the fabrics first so any shrinkage issues are done with.
My first quilt is a mix of a sheet, a twill weave solid, and a print that I'm not sure what it is. The sheet and the twill are wearing like iron but the print has faded really bad.
Your quilt, your rules.