The Colour Clock, a beautiful marriage of HEX and time
Whether you're looking for colorific inspiration for a website you're designing, or merely looking for an attractive and easy to read clock, The Colour Clock is for you. By default you get the current time, but you can click a button to show the current HEX value of the background color -- and yes, the HEX value ticks up, just like the clock. As the seconds pass, the background color changes, and slowly but surely -- bit by bit [get it?] -- you're exposed to delicious new shades.
Mac OS X users even get downloadable screensavers! Windows users will have to settle for pinning the tab in their browser, or dragging it to a second display.