This is a wallpaper I made for LMDE, I am making a theme strictly for this distro and came up with the wallpaper first.

I made a seamless tile for the background (as you can see in the second image).

In the download it includes everything.
The gimp files for the tile, plus two sizes of the wallpaper gimp files (2560x1600 and 1600x1200) plus two pngs of the wallpaper at those sizes, plus two sets of the tile (one set has highlights) in 4 different sizes.

If all you want is the image itself just get it out of the zip and delete the rest, just nice to have gimp files sometimes if anyone wants to change it or make it there own.
Open Source is great

Enjoy
Sam