Thrift store paintings, garage sale paintings.
I was not pleased with one of mine, so I started painting over it and the two paints I was using did some rather fun and interesting things together.
It reminded me of the ancient Japanese woodblock prints of ocean waves.
I did not finish this one as the paint reactions got me too excited to go and "try" to see if I could get that effect I wanted!
Danged it the paint was right and I was wrong - cause this came out just the way it did.
It reminds me of the view if you were in a boat at the bottom of a BIG swell of water in a story ocean.
* FYI *
Since I use a lot of found/leftover/freebie house paint, I have found that the expensive brands of paint are really and truly better paint.
Behr - Lauren - Divine - etc
Just in case you decide to go and make art with house paint.....