Yes this is actually one of the default wallpapers in Linux Mint 14. The amazing potography is called "Stars", made by Nicolas Goulet. All credits go to him!
I only added the Linux Mint logo, some more stars etc. (using GIMP 2.8).
I used a brush called "Aurora Borealis Brushes", made by Obsidian Dawn.
- Resolution 2560x1707
- Aspect Ratio ~16:10 (?)
- File Format PNG
- File Size ~4,8 MB