I love random stuff. For those with a widescreen, you will notice that every 60 seconds, the background changes. I love that. I am using Better Backgrounds plugin for WordPress.
One thing I did notice, is that you cannot download the background image if you like it. So I added this gallery to show, and allow, you to download them, if you so choose. I found these on various sites, and none of them (at present) are my creation. Cannot remember every single site that I got each one from, so I cannot help you there.
I will be adding more, and removing those that do not look so good. Be sure to check back to see if there are any new ones that you may like.