I took this theme I liked a lot: http://nale12.deviantart.com/#/art/Flatts-09022014-432924057?hf=1
and made it dark, and work better under Unity.
This theme will hopefully improve over time, if it does, it will happen here: https://github.com/baurigae/polar-night
The version I upload on this site is the version in the screenshot, however.
App icons in the launcher: https://github.com/NitruxSA/flattr-icons