I had thought about that, and/or have it show information about the colour, but decided against it in the end as I really like the single purpose nature of it.

I've also always quite liked the thought of people loading the site for the first time and not being sure if it's finished loading as nothing appears but the background colour, so then refreshing to reload the site, only to see the colour change and realise that the site is exactly what it says it is.