Looking at the photo, the first thing I think is that you should paint the walls green. Something along the lines of SW Secret Garden, SW Avocado You’d obviously have to check out a few different shades in the room, but what I’m suggesting is a combo along the lines of [this](https://i.pinimg.com/236x/8d/1d/1f/8d1d1fac097462ace0e4503a55335b0e–green-living-rooms-living-room-walls.jpg) to [maybe this](https://www.kbis.com/wp-content/uploads/2131-CatalinaAndBrentwood.jpg). How many paint colors to use between the living room and kitchen really depends on the layout of your house.
I don’t really know what this means “our current furniture is dark gray/dark brown with light blue and red accents.” You shouldn’t expect to transport your living room exactly from one house to the next. Don’t get hung up on small details like throw pillows and consider how you can move items from room to room.