What accessories and color curtains should i put on my green walls with black and grey sofa?

my walls and floor look exactly like this: http://a0.vox.com/6a00c2251f51e1549d00c2252518f8604a-200pi

this is the couch: http://www.mybobs.com/Ciera_Fab.aspx

My TV stand and shelves are all black brown but i am stuck on what color will work for the accents and curtains. please help!

What accessories and color curtains should i put on my green walls with black and grey sofa?