I've got two packages for two GTK2 engines, those being Murrine and Candido. Get them here and here, respectively. And well, I got tired of typing sudo apt-get update && sudo apt-get upgrade && sudo apt-get autoremove, so I just made myself a small bash script called update.
The script is as follows:
# Date: December 04, 2006
sudo apt-get update && sudo apt-get upgrade && sudo apt-get autoremove
You might also want to do this:
sudo ln -s /path-to-script
That way you just have to type 'update' into a terminal and your whole system will be automatically upgraded and old, unneeded packages removed.