Create Rainbow Logos with Warped Grids from PSDTuts.com
I decided for this tutorial because it was easy to do and you do not need extra things that from what Photoshop has. So its for beginners and up.
The writer does not tell you but this tutorial wont work in Photoshop CS (the one i have) and i dont know in which version and up will work…i guess CS 2. I am talking about the Warp tool from Transform.
Also before starting the tutorial reset your colors by pressing D on your keyboard, else you wont be able to have the same output.