Customizing Dock

Hey everyone!

I came to ask a quick question in regard to the the dock. I'm aware of the customization options under system preferences, but I'm looking to do something a bit different and creative. Whether that means changing the icons or getting a black border to surround the docks, I'm up for it.

So, is there any direction I can take? If possible, post some useful links and/or apps that could expedite this process. Any creative tips or suggestions are welcome.

Thanks!