Murrine

Congrats on your work, your engines are always the best when it comes to GNOME.
If you want something different than clearlooks' focus, then perhaps something similar to Nodoka's would work? That would mean a single colored line in treeviews (instead of clearlooks', which shades the whole background) and perhaps a simple glow outside of buttons would work as well. I don't think that it's necessary to come out with something completely innovative right off the bat, but at least having the basic idea and removing the dotted lines should work in the meantime. There is always time to keep improving upon it, and a lot of people are very excited about a stable release of murrine that would make everything else obsolete.