On Plan 9, the default background is a light, solid gray. In fact, the only way to change it is to a) hack the rio source or b) download a pre-hacked version th

On Plan 9, the default background is a light, solid gray. In fact, the only way to change it is to a) hack the rio source or b) download a pre-hacked version that someone like myself has written to allow starting with a different color. The reason is that quite a bit of care was taken to choose UI colors which work nicely together, and when you throw a brilliant blue background in there the whole thing kind of goes out the window.