What accent colors would go well in a living room with a black futon?

I would like to decorate my living room. Right now the furniture that I have is a black futon, black end tables, and a dining table with chairs with blue upholstery. I also have a dark green chenille blanket throw. I would like to use blue as one of the accent colors (i.e. with throw pillows or wall decor or something like that). Does anyone have any suggestions as to what colors would go well together with the furniture I have right now?