I've been experimenting with Apophysis, a freeware fractal generator. The one below is my favorite from a couple hours of tinkering.
Kind of cool for those of us with limited artistic talent to shape (via parameters) and filter the computers 'musings' into something beautiful. If you have any interest in fractals or digital art, I would suggest checking it out.
As always, make sure to virus scan any executable downloaded file (I like VirusTotal) and ideally run the program sandboxed.