If you're up for some new skins for Ableton Live, I've got 5 new ones you might like. They're all mid to dark, often greys or off-greys with bits of colour. The skins are optimised for Live 9, but will work in previous versions as well.

Ableton Live Skins 7

Download the free "Ableton Live Skins 7"

You can find even more skins here. If you don't know how to install new skins, here's a quick tutorial.