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DockMod gives you the ability to customize your OS X Dock.
Compatibility with 10.9.4
Blank themes when importing older versions.
I've never said something like this before, but please stay far away from this sucker as possible. The author claims to offer an unlimited trial of the software, but I've never seen a bigger piece of nagware in my life. Once you alter your dock, the icons' titles get the extra text of "DockMod Trial". In addition, a red scrolling banner / ticker text appears under your dock about the software being unlicensed. This was all within ten minutes of usage. Man, this guy really wants his $8 bucks. Different folks on Apple's forums have struggled with getting DockMod uninstalled.
If you want a transparent dock on Mavericks or other tweaks, grab the free cDock on SourceForge.