I have a piece of card stock on my table that I've been using to paint things on. I've been using the same one every time. I had just finished painting something and was swirling the brush around on the card stock to get the paint out and realized how cool it looked. Well, cool as defined by me anyway.
It may not ever end up in a fancy schmancy art gallery but I like it. Of course this gave me an excuse to pull out the camera to take the picture of it. Like I need any excuse.