As a matter of fact....
I looked at it differently when I chose to use the blue (sky) and green (grass) colors in my coop. In winter, there is nothing but white, or brown if there is now snow. The brighter colors are better for me walking into the building, and I think for the chickens as well. After growing up on a dairy farm where everything was coated with whitewash annually, and getting it on all my clothes every time I touched it, I didn't even consider it. So long as I keep it cleaned out, there isn't a fly issue inside it either.
I painted my walls and my nest boxes. Walls are like a cream color, nesting boxes are taupe, I had heard they like dark nesting boxes (can't tell much of a difference in the photos). I used exterior paint that I got off of craigs list, a painter was selling unopened cans that he didn't use for $10.00. He was in Buffalo.
