Learn how one of the sping wallpapers was created. Open a new file having
1440x900 px and
72 dpi. Then applying this instrument

, represent the background of our picture.
Blending Options-Gradient Overlay
Gradient’s parameters: 
Select after that the here shown instrument

and represent the main element and several circles. The first one should have this color-
5A89BB.

The second is painted in
4D80B6.