The hex clock seems to jump every once in a while, probably compensating for the large difference in the number of hexadecimal color values and seconds in a 24 hour day.
How are the color values related to the seconds here?
As I understand: hours are red, minutes are green, seconds are blue. Simply formulated as HTML color #HHMMSS (and with each component scaled appropriately to 00..FF so that 00:00:00 is #000000, 23:59:59 is #FFFFFF)