Ski Wallpaper Freebie WP7
This is a Windows Phone 7 wallpaper. I think the words are quite motivational. Direct download links to 480×800 version. Go to Dribbble post for the 320×480 version.
Helpful hint: Dribbble users are nice. If the license is unknown, it is usually because they forgot to mention it explicitly; not because they were being stingy. Ask nicely and they will probably allow you to use it.