Color Changing Wallpaper

Perhaps at night when the thermostat is set below 65 as it is in my house, it turns black with stars. Then when the heat goes above 72 it's happy beach scenes. Above 75 it's a desert with daddy standing there with his pockets turned inside out looking up into an empty wallet.

If having this on the walls was a bit much, just having a white celing that turned to black with stars at night, maybe even with clouds and moonscapes would be something that I'd probably buy.

Not sure if there's a need for it but you could also have this around vents to visually indicate warm air was coming out. Hvae it turn red or white in the area that's headed by the diffusers.