Here is a large list of cool backgrounds and designs that you can download for free. All available as JPG or PNG format.
1. Dark Background Design
This is a nice background design with dark tones and lighting effects.
2. Cool Background
3. Earth Awesome Background
4. Template Background Design
5. Technology Background
6. High Quality Background Design
7. Colorful Cool Background Design
This is a nice background design with vibrant colors.
In this free list of cool backgrounds you can download awesome background designs to be used as a desktop wallpaper or any other purpose.