Begin by bringing in throw pillows with a mix of the colors on a white background. T.J. Maxx and Home Goods store are a great resource. Also add a few other accessories to the room in both small objects and larger ones that have Navy and Aqua. Keep in mind art work and rugs are also a great way to introduce a range of colors or top things of with drapes in those hues. Good Luck and enjoy the treasure hunt!

Also if your thinking of using the wall color pictured here lighten it up a bit. With the Navy sofa you might try Benjamin Moore in Maritime White. Not as strong but will still achieve the overall feel.