http://vhanla.uni.cc/videos/blacky.htm to watch a screencast if you don't know how/where to find that file in order to replace with the one provided.

Replace the default.dll file with this one to change the theme

Hope you like

Download it from here: rar: http://vhanla.googlepages.com/BlackBit.rar or zipped
http://vhanla.googlepages.com/BlackBit.zip

UPDATED:
With this batch you can automate that tedious process, it replaces every image you edit.
I included all the images, (some) are from this theme, just edit them en exec update.bat, it will overwrite those images inside default.dll, so you will only need to replace the resultant file inside the path where the original relies.

Theme images ready for editing and updating default.dll: http://vhanla.googlepages.com/GChromeRES.zip

PS: Reshacker.exe must be presen

Damn, this one looks awsome. I might try it later on.