Color is a very personal thing. You need to make sure to choose a color that makes you happy. But I don't recommend accent walls - choose a color you can live with on all four walls.
You don't have to paint your walls lime green just to try to have your home feel decorated. If you're a classic dresser or preppy dresser or a modern dresser, you wear a lot of black - whatever it is - your home should reflect that as well.
When I see a wall that's hung with different objects, framed or unframed, what I like about it is its fluidity and rule-breaking nature. Just experiment a bit.
