Help: complimentary paint colors

Confession: it took me TWO YEARS to finally pick the colors we recently painted the living room and kitchen. This is sad because one of the reasons why I couldn't wait to have a house was because we would finally, finally, finally be able to paint any color we wanted.

Next week my mother is coming to visit me in Texas for the first time. This is the first time she's seen my house! Before she gets here, I would like to paint the downstairs room (which will become Husband's music room/ office), but I just can't commit to a color! I don't have two years to get this done-- she'll be here next Tuesday! Dear readers, I need your help!

Below are the colors that we already have in our downstairs.

My house

I would like the music room to be a complimentary color since it's right off the living room. It also has a guest bathroom attached to it (the most used guest bathroom, since it's the only bathroom we have downstairs). Any suggestions for one or two complimentary colors? I'm in quite a pickle, as the Husband isn't a fan of pastels or earth tones. My trim and ceilings are off white, and the color can't be girly because I'm pretty sure I'm going to have to start referring to the music room as the Man Cave, since Husband and his man friends will be spending quite a bit of time in there. They so would not appreciate a nice, bright fuchsia.