After painting fabric for skies, I had some diluted paint left over - couldn't throw it away! I had seen a small wall hanging that was mounted on painted quilt batting.
So,I dug out my bag of scraps. I floated the batting in the paints, swished it around and added some blotches and lines of paint.
The result looks like a felt with an interesting texture. It would make an interesting background fabric for embroidery, beading, postcards, or ...?