Edited 20-12-14: I ran across this brilliant What color is it and couldn’t resist bolting on the rather neat idea of colours based on the time.

Yesterday I found my XKCD book that I was given for Christmas and whilst leafing through it ran across this gem about factoring the time.

Having an hour spare this morning I could help but built the factor clock above. View Source for the code, most of which is a little ugly and the factoring code is borrowed (cited in source)