To follow Owens suggestion, here are screenshots of my current polish items:
Folder icons for xdg folders in the file chooser: http://mclasen.fedorapeople.org/screenshots/xdg-folders-filechooser.png and in nautilus: http://mclasen.fedorapeople.org/screenshots/xdg-folders-nautilus.png
New tooltips look: http://mclasen.fedorapeople.org/screenshots/gedit-tooltip.png
Matthias