What you're describing is pretty neutral... add a pop of color with your towels and accessories! Burnt orange? Turquoise? Burgundy? you have many options! What is your favorite color? Or if you don't have any artwork on the walls yet, look for something you love and pull the colors from it for your accessories. Have fun with it!

I think gold accents would be nice! Here are a few ideas for you:

http://deciture.com/harper-vase/

http://deciture.com/cki-rectangle-wall-mirror/

http://deciture.com/serenity-wall-mirror/

http://deciture.com/cki-myriad-tray/ (could place rolled up hand towels on here)

http://deciture.com/novara-medium-ceramic-dimensional-wall-decor/

Hope this helps you!

You could use oil rubbed bronze details to echo the brown in the floor. Or gold as Warner suggested or even brushed nickel. As Triad suggested your colour scheme is pretty open and you can use art and towels to suggest the accent colour you wish.

It is a pretty neutral color scheme right now. Your powder room could defiantly benefit from an accent color. How about apple green color for accessories? Oil rubbed bronze for hardware.