I like the tan walls, myself. That's what I have in my sewing room too. Neutral without being bland, touch of color without being too specific, and just a little bit warmer than plain white.
I'm lucky though, and my sewing room gets a good deal of natural light. (Although I often find myself sewing at the extreme ends of the day...2:30AM seems to be my prime creative time, whether I get there by staying up super late or by waking up super early! LOL)