A set of iris for 3D eye ball.

I use them in my 3D art ( example : http://etory.deviantart.com/art/Terra-Tenebrae-WIP-2011-12-20-274940093 )

I use an iris brush by Robson Bernard which is licencied as :

Brushes set made by Robson Bernard
Found at: http://rbcampos.deviantart.com
 
Note: this set of iris brushes is freeware and you may use it anyway you want to. If you want to upload it in your website, please, let me know: Robson Bernard - rob26rj@hotmail.com