Putting fabrics together is my very favorite part of quilting. Many times I just collect the fabrics and don't do anything with them! The other day I made the mistake of commenting on a crocheted item - the person who made the item stated that they use whatever yarn they have. I said that I wouldn't do that - and was told that I did it all the time with my quilting, mixing whatever I had.
Some people don't have a clue........