Awesome wall - and a dark grey leather couch might be awesome. There are other couches in your usual board. Q distressed paint finish, achemy liquid copper, gold, silver BM¤ (note comments on sofa and pillows.
The trend for copper is still hot. For a copper splashback, use these stunning Copper Leaf tiles by Original Style. They contain real copper file encased in glass for a protective finish that won't tarnish.