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!
-> http://www.flickr.com/photos/nicolasgoulet

I only added the Linux Mint logo, some more stars etc. (using GIMP 2..

I used a brush called "Aurora Borealis Brushes", made by Obsidian Dawn.
-> http://www.redheadstock.deviantart.com/art/Aurora-Borealis-Brushes-68718527
-> http://www.obsidiandawn.com

Image Properties:
- Resolution 2560x1707
- Aspect Ratio ~16:10 (?)
- File Format PNG
- File Size ~4,8 MB