Mount Snowdon, Wales
My current wallpaper, which looks great with Gnome, so I'm submitting it for the Ubuntu wallpaper competition. It's a crop from the absolutely massive (83 megapixels!) www.flickr.com/photos/vellender/5993862150, so lots of different resolution crops available :)
This has reached the shortlist! It's great to see so many views and people linking to this in blog posts and so on. Glad to read some nice comments about it - if you want to see more of my stuff, have a look in my Most Interesting photoset.