I hope it is OK for me to post this here, I usually just lurk as I am no really creative enough to make anything worth posting. However I made this brush and have found it rather useful so I figured I would post it and hope others find it useful as well.
It is an eye brush, I use it as a stamp to make eyes a lot more quickly and easily than drawing them each time. I use the brush to make the eye on a new layer, then adjust the size and position, erase any part that would be covered by the eyelid, then use the color balance to change it to the color I want. Oh and I use the feather tool to blend it into the eye.
Here is an example of the size and color changes,
http://i141.photobucket.com/albums/r56/MoonStarRaven/Temp/Eyes.jpg?t=1208051714
Eye 2.png.zip