Customize lion dock with yosemite-like one

don't see an instant easy way of getting an exact Yosemite dock for you but you might be able to figure something out using
http://www.panic.com/blog/candybar-mountain-lion-and-beyond/

there's an overview here
http://computers.tutsplus.com/tutorials/how-to-customize-the-look-of-os-x-lion--mac-159

maybe try searching here for possibilities too
http://www.deviantart.com/browse/all/?q=osx+dock

just remembered... select 2D dock in this

http://tweaksapp.com/app/lion-tweaks/

you may find that
http://www.bresink.com/osx/TinkerTool4.html
is useful for Lion too