Jack Hughes is a digital designer- one of his newest experimental projects is a color clock that represents the current time as a hexadecimal color. First released in February, by early March his site had received over 40,000 hits.
It is available to download as a colorful screen saver. You may read more about hexadecimal colors here.
There is a very colorful arrangement of a Hexadecimal color chart at CoolMaxHot here.
