Cool GIMP Tutorial Links

Try this one

Smoothening skin texture.
http://www.digitalphotoguides.com/flawless_flesh.html

Creating a 300 type skin look
http://www.gimpusers.com/tutorials/dragan-effect-simulation

Create electricity/lightning effect on objects
http://www.gimpusers.com/tutorials/electrifying-objects-electricity-effect

Create a zig-zag effect
http://www.gimpusers.com/tutorials/create-colored-zig-zag-pattern

Creating an exploding planet
http://www.gimpusers.com/tutorials/exploding-planet

Creating foggy rays
http://www.webdesign.org/raster-graphics/gimp/leopard-s-aurora-borealis-wallpaper-in-gimp.17153.html

Creating light rays
http://www.webdesign.org/raster-graphics/gimp/easy-way-to-create-light-effects-in-gimp-in-9-steps.17155.html

Signing Off
Ryan