Learn how to design wallpaper from scratch.
Start by creating a new layer that would have
1024x768 px and
72 dpi. The
Rectangle Tool (U) will be helpful in creating the background of the picture to be next.

The layer’s parameters:
Blending Options>Gradient Overlay
Gradient’s parameters: 

Take the
Ellipse Tool (U) now and begin representing the first layer for the logotype to draw next.

The layer’s parameters:
Blending Options>Inner Shadow
Blending Options>Outer Glow