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.
Textured, fancy walls are so in right now—and watercolor walls are just continuing that trend. Check out these pretty rooms that style the watercolor wall mural really well, for inspiration on how to do it in your home.