I was really intrigued when I heard the rumor that the new apps will each have they're own specific color. I didn't really know what to think of it, thought it was kinda bs, and could never see Jony doing something like that. Anyway, I tired to see what that might look like. First I was changing the music app to look more like the WWDC app, and then went from there. There's definitely not enough colors to go around, so if this rumor does turn out true, perhaps the utility apps will just use the grey like in the WWDC app. Just experimenting.