I have two dark grey sofas and I am eager to lose them as I can't find anything too complementary for the either! They seemed like a good neutral tone at the time but being dark they have showed up lots of stains (young kids). Your question was cut off but if you wanted to add a rug or furniture, I might suggest an orange/rust tone or even a red? But the colours of your walls will have a big impact... Hope this helps. :)

@mazpt, yes of course. Here are a few more pictures showing how kitchen, living and dining, and outdoor deck and bbq area flow together. Oska kitchen is really neat in detailing; wood grain on the doors for example, are matched across as many doors as long as a 2.4m sheet allow. Floor turned out very nice too. Light natural colour, wide and long boards, laid length way all the way from front door to the back makes the space looks a bit bigger. Although it is still a floating floor, there are minimal floor movement that make squeak sound, most of the floor are feels solid. I hope that floor squeaking noise will settle over time.

For a masculine scheme you cant beat choc, navy and cream/white. With natural textures sisal/wicker/weave.

It might sound crazy, but consider charcoal on the walls behind the green sofa - both the wall behind it and immediately adjacent wall too. The strange thing with dark wall colours is that dark furniture visually melts into it rather than your home looking a bit like a museum/gallery space with lime white. If you then place some modern artwork above the sofa it will look amazing against charcoal. To balance the dark walls, just be sure that on the opposite side of the room have some low dark furniture (like armchairs, or dark timber cabinet, etc). Here's a nice example of grey/charcoal 'absorbing' darker furniture And another with more traditional pieces; Hope that helps as an unusual option!