I can't believe nobody has made an App that uses core image to adjust the Dock files and then automatically add them to the Dock and restart it. It just makes so much sense. Then you wouldn't need Photoshop, Terminal or Activity Monitor. You'd just make your color adjustments (there could even be a fake Dock preview that shows you what your changed Dock will look like) and then hit Apply and your Dock would quit and come back with your changes made. It could even backup the original Dock so you can revert at any time. Someone make this App!
Lot's of people are lazy... i don't have any coding skills, but if i would, i would be making this app.
PS: nicest indicator icons i have seen are the arrow ones!