Wrap some baker's twine or other string around a wooden block to create a graphic textured stamp. -can also use rubber bands- Stamp on inside of paper bags from grocery store or paper that comes in mailed packages, use as wrapping paper.
I am terrible. This must be very valuble art, but looks to me like a DIY. Buy 2 pcs of canvas and make a swirl on Put one top of Move them a bit sideways while the paint it wet. - This is abstract bacl wings painting.