Growing up, I had natural wood furniture similar to the furniture in your son's room. I picked it out myself in about 2nd grade and I still love it (though the pieces are now scattered throughout my younger siblings' rooms). I went through a bunch of different phases where I liked/hated certain color schemes and styles, but the furniture always fit because it was neutral. It worked well when I was going through my bright primary colors phase and had a BRIGHT red quilt, and later it looked great with a more delicate ivory and pink double-wedding ring quilt.
And now I'm leaving this board quickly so I don't catch the pregnancy bug...!