Photoshop Tutorials

Start a new document. I used 800x800.
Go to Edit » Fill, use: Pattern, select custom pattern and choose this one:

Now go to Filter » Distort » Polar Coordinates
Options: Rectangular to polar.

Then apply. Filter » Distort » Pinch, Set amount to 100%

Then Press CTRL+F 3 times to reapply the filter.

Now apply: Filter » Distort » Spherize. Set amount to -100%

Then reapply by pressing CTRL+F about 3 times (its up to you).

Then go to Select » Inverse

Then go to Filter » Blur » Radial Blur
Amount: 70. Blur Method: Zoom, Quality: Good.

That's it, just apply colors using hue and saturation and use it for your backgrounds/wallpapers.