I also vote for whatever color you love. Also if you like wallpaper border they have some very cute ones with laundry themes...clothes on a line, old washboards, etc. Just go to any wallpaper web site and do a search for laundry or laundry room. I would love to do that at about chair rail height!
All of the cabinets in my laundry room are cream colored and I have this washer and dryer. We're going to put a light sand colored formica countertop over them. So I'm leaning toward a light blue, almost white color for the walls. I agree with everyone else: the lighter the better. My laundry rooms have always felt like caves and I REALLY want something light and airy for once!
I'm soon to paint my tiny mudroom/laundry room in Bonny Cream (a pastel yellow), by Behr paints. It's the same color as my kitchen and dining area, which connect to the laundry room--bright, happy, and ensures continuity instaed of "choppiness."
i just painted mine a color called lemonade........it looks a little more like limeade to me, but i loooooooooooove that room now. it's little and i spend so mch time in there. i put up some shelves and a hanging bar and my laundry life is soooooo much better now. i love my laundryroom.