Since discovering the Peter de Jong attractors on the site of Jared Tarbell (an all time hero of mine) I've always enjoyed how something so weird and complex is created by just a few lines of code.
After rediscovering my 2005 (AD) AS2 ports of the Peter de Jong attractor I ended up pushing 100,000,000 particles around a 25,000,000 pixel HTML5 canvas object as an experiment (yes it can be done and isn't as slow as you'd think) I then had an idea to create a video of the Peter de Jong attractor going from 0 to 20 in 0.005 increments (on all 4 'seeds').
In the end I only got to 6.855 because it started to look a bit 'samey' and was taking too long. I should mention this was not using canvas as I couldn't work out a direct way to save images to disk. I went back to Processing (Java) which made the task easy. 12 hours later, I had 1371 1920x1080 PNG files ready to be made into a little video.