Though currently only trying the odd LXDE distro on a usb stick, I'd be interested to know about this. On the LXDE panel you can right click and choose for the panel buttons to be 'flat' as they're described - the box surrounding the names of the programs running disappears, which looks better than in Gnome. As LXDE still uses gtk I'm thinking that this involves some code that would be transferrable to Gnome. I'd like my Debian 6 pc's 'Window List' buttons flat like this, with ideally maybe the active program having its title in bold. Yesterday I managed by trial and error to make the volume icon on the panel use a pixmap identical to the panel background when clicked, so that it matched other right hand panel icons -instead of being backgrounded by a block colour - but I didn't manage the equivalanet thing for the Window List buttons.
Thanks for any ideas/ facts/ enthusiasm.