change the dock look!

open up, su to root, type "cd /System/Library/..." until you're in the folder, the type "cp left.pdf ~/left.pdf" and the same for center and right (this copies the originals to your home folder. Edit the pdfs in photoshop, then from just reverse the cp: "cp ~/left.pdf left.pdf"

If you don't have root access enabled, you'll have to enable it from within netinfo manager