The images that are used to create free desktop wallpapers are usually raster graphics, which have the same size as the display resolution of the computer. This is to enable the free desktop wallpaper to fill the whole background of the computer. As most of the screen resolutions of computers are proportional, images scaled to fit a different sized screen is found to be in the correct shape. Although wide-screen monitors have different aspect ratio requirements for the free wallpaper, the images that are designed for standard monitors can be scaled to fit to the monitor without any loss of quality.
The styles of free desktop wallpapers are as varied as people are. They can be made using photographs, 3D renderings, abstract patterns with complex gradients, or drawings. It is always better to have plain areas in the wallpaper to facilitate a better view of the icons. Wallpapers are also created categorically, like of cars, holiday photos, movies, pets, etc. However, those in business and IT departments prefer to use corporate logos or plain backgrounds.
