てとらぽっと

Photoshop fun making an eyeball - Updated!
http://www.sxc.hu/blog/post/1161
This tutorial in Photoshop.
(Maybe can make at GIMP, I think)

Realistic and beautiful making eyeball tutorial from stock.xchng and you can get Eyeball.atn file!
(photoshop action file)
You apply this tutorial and can make your original eyes.
A lot of photoshop tutorials arrival here.
And a many free textures you can use.
Can commercial use but, must read the license.