Painting Clouds by Steven Stahlberg

This tutorial is simply awesome. Steven Stahlberg will show you how to use Photoshop to pain realistic clouds.

"(Left, cropped from a larger image.) I start with a ramp like the one on the right; be careful not to use full saturation here. Up to your preference, if you want to make the background a little more purple..."

Read more: http://www.androidblues.com/cloudtut.html

Steven's official web site: http://www.androidblues.com/