In this tutorial i will explain what the best wallpaper color as your background is.
What color do you like?
First you need to decide what color you like. For example you like blue. Close to is the color black, so you need to find a wallpaper with the colors black and blue.
Match your icons
Second you need a wallpaper that matches the icons on your desktop. If you have light colored icons i suggest you find a dark colored background.