I have been playing around with painting paper towels...it is very addictive. Not sure why, except that it is fast, fun, and cheap. It is something that I can do a few at a time, and it doesn't require a large block of time.
Some are painted with watered-down acrylic paints. Some are painted with fabric dye. Somtimes I go back over with another layer of paint after they are dry, or stamp with paint or ink. Metallic paints are fun to use too.
I have been using them in my fusions as well as postcards--they can be sewn through just like fabric.