Mint has always had gorgeous backdrop images for the desktop. The photographs by masterbutler are incredible.
But if you are on a small machine, like my ASUS eee PC, you don't have a lot of hard drive space.
You could just delete a lot of things, such as the backdrop files, but that would be a shame. Instead, I choose to resize them to fit my 800x600 screen. To be honest, I am not missing anything. The images surpass my monitors ability to display them in all their glory.
Since Mint comes with Gimp, this is an easy task. The directory is /usr/share/xfce4/backdrops. I hesitated to "undo the beauty" by reducing the size until I opened the credits file. Masterbutler has thoughtfully provide a link to 80+ pages of wonderful images at http://www.flickr.com/photos/alwbutler/.
Go ahead and scale those images. You may find yourself using the space to enjoy more art by masterbutler.