With a tablet (I use a wacom) and smudge painting technique, you can do 1000 times better than any plug in will do. Now Mine will not be a top shelf example but here is one I did of a cat. using this technique
There is a great DVD that teachs this technique but I cant think of the guys name right now. Brad something. He was on the Canon forum for a long time showing off his work but got booted cause they felt he was violating the no product promotion rule. I will get his name off the DVD tonight and post it if you like.