Check out 'Photoshop Guts'
We've uploaded a new tutorial this afternoon titled Photoshop Guts.
This tutorial will show you how to create the effect of lava crust or photoshop guts as l like to call it for your signature, which really gives a great look to your banner or signature backgrounds. This technique could also be used to create awesome desktop backgrounds and/or webpage backgrounds. It's fast, it's easy and it's fun.
Read Tutorial: Photoshop Guts.