Learn how to design apple desktop theme in this tutorial. Create a new file that would have
1280x1024px and
72 dpi. Applying the
Paint Bucket Tool (G), paint it in black color.

Next we have to choose the
Brush Tool (B), having the
Opacity of 40% and white color to represent a flare on the lowest part of the picture.

Select the
Ellipse Tool (U) now and draw a kind of sphere above the flare.

Fill 0% on the layers.
Blending Options-Inner Shadow
Blending Options-Gradient Overlay
Gradient’s parameters: