I picked up another idea from The Documented Life Project - making painted circles. Mary, over at Me, With My Head in the Clouds developed this technique of making freehand circles with acrylic paint. She even posted a step-by-step tutorial, so I'm not going to go into all the details as her tut is clear and already done!
Suffice it to say, this technique is fun and addictive. I seem to be in a playing phase, not an actual competing a real project phase. On the plus side, I now have all kinds of stuff to add to those real projects - one of these days.
The basic technique is done by hand - dip your finger in acrylic paint and paint a small circle with one color. This will be the center of your finished circle. Then paint other colors around your center circle - going half way or a quarter of the way around with each new color. Add white highlights, again with your finger. I used a small brush on some of the white highlights so I wouldn't get a big blob- I either have fat fingers or limited fingerprinting skills or both! Then use a bottle top to stamp a black circle around your painted circle. I love the double circle stamp I found on my desk- it's the round doohickey from an empty roll of tape. Don't worry about precise circles - the look should be loose and grungy. I stamp two or three rings before adding more paint to my stamp so some are dark, some lighter. Then flick on some of that black acrylic paint - I use an old toothbrush loaded with slightly watered down (just a little water - you don't want it too runny). Be sure to cover/protect the stuff on your table- I stand an old spiral bound book behind the pages I'm spritzing to contain the splatter.
It's fun to experiment with colors. After several pages of these, I found I like the lighter colored ones best, but that's just me.