Attached Link: http://market.renderosity.com/mod/forumpro/showthread.php?thread_id=2660658

Lots of links to tutorials on texturing and painting in that thread.  Maybe something in there will help you.  Making a second skin seems pretty much along the same lines as making a "skin" texture.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi