I have a nearly potty trained toddler, and we use them for lining the carseat when we go in the car (just in case of an accident).
I also just used two to make a really cute doll sleeping bag. I covered them with a pretty fabric and then sewed them together on 2 1/2 sides. The result was a kind of quilted doll sleeping bag.
I also use them for scrubbing the floor. They are really absorbent, and won't scratch wood.