Hue+ wallpaper mode
Have colours match the main colours that are currently set on the desktop background.
On launch of an app, switch to custom lighting for that specific app.
Or maybe just have a mode where if an app is full screen, it switches to a custom lighting mode. (For example, if I have a blue wallpaper, the light starts blue but when I switch to a green app, it has green lighting)
Have you considered building a Rain interface? I'd really like to see access to Cam stats on my Rain desktop as well.