background image should tile in original resolution by default

[lukaprincic]

when I upload a background image I expect it to be tiled in it's original resolution, not stretched.

I don't think anyone likes the stretched image in the background. If I want a big heavy image in the background, I'll upload it and maybe I can turn off tiling (an option/toggle in the design section?), but I would rarely want to have it stretched. To me it is always ugly.