This is my desktop. Although I use ubuntu, I like Fedora's solar theme very much!
I wish Ubuntu had a nice blue theme. I am using usplash, gdm , wallpapers etc from Bluman. I like Fedora's Nodoka GTK theme and also their Echo icon theme and Bluecurve cursors - very original and refreshing. Without much ado, here's my simple desktop :
As a side note, although a theme is people's personal choice, I wish people stop blatantly cloning Windows' or MacOS' themes.
Also, I must appreciate OpenSuse's very professional artwork.
On a sidenote to using gtk apps on kde-4.2 (like RealNC posted), those using gtk-qt-engine may have observed that running gtk apps as root (with sudo) has the ugly default gnome look - to rectify this, copy over ~/.gtkrc-2.0-kde4 as /root/.gtkrc-2.0. Also, those using 64-bit linux and a gtk engine not in default gnome, for the 32-bit apps like acroread to look the same, do copy over the appropriate 32-bit theme engine library to say /usr/lib32/gtk-2.0/2.10.0/engines/. I wish the fallback theme of gnome was a little more aesthetic .