Shows the current 24-hour time, but links it up to the hexadecimal code for colors, so the background is perpetually shifting color every second. I could stare at this for hours, it's quite mesmerizing.

 

https://lh6.googleusercontent.com/gL3nLZSbWHVXlx9hFVJq4EjbJ3wkoyNVb5SP_ybyjo8dB5ao9DfExBUBFq2ch4KSlq4KH15OVQ=s640-h400-e365