I like the Arc theme, but I also love the Zenburn colour scheme. So I fired up Sublime Text [UNREGISTERED] and changed a few values, and also edited some images in Inkscape and GIMP, and came up with something that I like. I made this for my own personal use, so as for now it's incomplete, but works nicely for GNOME shell.
- GTK2/3 theme
- Gnome Shell theme
What doesn't work / isn't Zenburn style:
- Cinnamon theme
- Unity theme (probably)
- Xfwm4 theme
- Plank theme
I have some issues using Dash2Dock extension for GNOME, I just end up overriding the system (Arc-Zenburn) theme and choosing #3f3f3f for the background colour of the dock.
Update in 0.2:
- fixed a lot of the GTK2 elements with Imagemagick