Hmm, lots of space left. We use beige because everything shows against it: White, black, gray, yellow. Then one day I noticed that our background is almost the same color as buff trace, and it's probably for the same reason. It's interesting how you can go through a completely different process and get the same conclusion as someone 100 years ago or whatever.
What else. In AC8 and before, each window had its own background color. Now there's only one, but the grid color is unique to each window. I'd like to have one detail window with a white background for making object previews.