In physical geography, a dune is a hill of sand built by aeolian processes. Dunes occur in different forms and sizes, formed by interaction with the wind. Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind. The valley or trough between dunes is called a slack.
Sand dune that consists of gypsum and sand. These dunes can catch in the deserts of Mexico. The photo shows a sand dune in the light of the setting sun. Dune is covered with grooves in the form of waves in the wind. Pleasant, warm wallpaper for iPhone or desktop.

Tips on choosing wallpaper, the factor of choice - Colours:
Among other things, is very important colors wallpaper. Tonality of the background screen in many ways can determine your mood and attitude. In principle, in this regard, the selection of pc wallpaper similar to the usual selection of wallpapers. For the home computer is better suited soothing, relaxing colors, such as, for example, green or blue. To work is better to choose a more invigorating tone. Perfect white color, it activates the operating resources and invigorates. Suit and shades of red, but you should not do this color is dominant on the desktop, because it can cause irritation in large doses. "Golden mean" in the choice of tone for the desktop wallpaper will be beige and brown tones, these colors are neutral, and well go up to any screen.