Hi there,
I too wanted this. I managed to get it set up, but it took quite a bit of work. My instructions are below, but I'm running windows 8 and the steps won't be the same if you're running a different version.
First I downloaded Nexus Dock: http://www.winstep.net/nexus.asp
Then I downloaded one of docks Gaspershooters linked you to, and customised it to make it solid white and semi-transparent, with a very subtle outer shadow.
Then I downloaded AeroGlass 8.1 (only needed if you're running Win 8): http://www.glass8.eu/
Then I downloaded AGTweaker to tweak the blur effect of AeroGlass (it wasn't a large enough blur): http://www.glass8.eu/
Then I was able to click "Enable Vista Glass Blur Effect for semi-transparent dock backgrounds" in Nexus Dock settings
And voila - I have an almost identical dock to Yosemite.
