Creating unique abstract paintings is an intellectual, as well is intuitive, challenge. I find some paintings made with ready-mixed paint rather boring. While very easy to use, these pre-mixed colours annoy me somewhat. I like the challenge of mixing my own paints. For example, to make green add yellow to blue. Brighten the mix by adding some white. Experiment with the colours to see what you can create! Mixing up some primary colours (red, blue and yellow) plus black and white can produce amazing results.
The above painting is all green glory and fun to create.