With the help of some free Gimp plugins (Planet Render and Star Scape) I have made the image below. While it might not be as good as the plugins from Flaming Pear, it is still cool that You can make some nice images using free software.
If I would have tried a bit harder, I might have been able to do something that would have looked a bit better. The image below is just to show You what is possible. (The image has also been compressed to a jpeg image so that it will load faster. This compression have added some distortion as well…)