This is my current desktop, I have tried many different looks over the last year and a half (including popular GTK engines like 'Murrine' and 'Aurora') and icon themes such as 'nuoveXT' (a favorite of mine for some time and I still love it).
I have recently settled on this look as it is perfect (for me) as it is clean, clear, fast and attractive

What you can see in the screenshot:

* Ubuntu 7.10

* Clearlooks

* OSX Icon Theme (GNOME-Look)

* Aqua Advanced Metacity (GNOME-Look)

* Flow Wallpaper (GNOME-Look)