Since the sheets are very patterned I would stick to more solid throw pillows, maybe a pop of color, or if you want a print, make sure it’s a simple or large pattern.
I like these 3 together for on a – it will tie in the black and white but bring some fun color…
Polkadot yellow: http://bit.ly/1qzSn4p
Large pattern w/ color: http://bit.ly/1qzSs8d
Solid pretty color: http://bit.ly/1qzScWQ
Hope that helps! XO!