I attempted to try out the new Cairo-based version of Clearlooks this evening. First I tried wrestling with the PKGBUILD from the AUR, which didn’t work (complaining of some strange cvs problem). Eventually I was able to get hold of the source from cvs, and nudge ABS into building a package out of it by modifying the PKGBUILD until it did almost nothing.
Unfortunately, switching to the new version of the theme just caused everything that used GTK2 to immediately crash. Followed by X. After restarting X and logging back in, stuff worked again, but the new theme still wasn’t working as it should. Scrollbars weren’t themed; text boxes had their borders missing until you moved the mouse over them, and it looked a bit of a mess.
Since fixing it so that it worked is way beyond anything I’m remotely capable of, at that point I gave up.