Contemporary Fireplaces What Accent Colour Should I Use In My Living Room?

What accent colour should I use in my living room? - contemporary fireplaces

I'll give you a contemporary look. I have gray-green walls, black and red sofa, dark wood furniture (fireplace, coffee tables). My floors are made of natural wood, but looks too yellow. What color would look good for curtains and cushions? They are fashionable colors?