A complete tutorial on how to make this Mac Os X Wallpaper.

Open a new file, having 1280x1024 px and 100 dpi. Make it look black.

Create Mac OS X Free Desktop Wallpaper in Photoshop CS

The next tool will help us to represent the basis for the logotype we want to represent now.

Create Mac OS X Free Desktop Wallpaper in Photoshop CS

Blending
Options-Gradient Overlay


Create Mac OS X Free Desktop Wallpaper in Photoshop CS

Gradient’s parameters:

Create Mac OS X Free Desktop Wallpaper in Photoshop CS

Blending Options-Stroke

Create Mac OS X Free Desktop Wallpaper in Photoshop CS