Mac: Customising the look of your Mac's operating system isn't always the easiest process these days. That said, if you're interested in tinkering with the dock in Mountain Lion or Mavericks, DockMod allows you to do just that.
DockMod's pretty straightforward: once it's loaded up you can change the colour, gradient, shine and image in your dock. You can do this on a space-by-space basis, or make it a system wide thing. You can also save all your modifications as themes so you can swap between them quickly. As with system-level tweaking tool in OS X, you might notice some quirks with DockMod, but we didn't have any issues in our tests. You can check it out for free for an hour at a time, or purchase a licence for $US8.