If you are looking for something a little more unique to tell the time, you might like the Binary Burst Clock that Mike Szczys from Jumptuck has built. Each of spires around the outside of the clock face represent a binary representation of the time in binary. Check out the video below to see Szczys explain how the Binary Burst Clock has been created and to accurately tell the time.
“The clock uses 3 LEDs on each spire to count up to 5 in binary. The hours are displayed by the middle LED in RED (Its a Red/Blue bicolor, the others are just blue). Video, and links to the board and code repository are included in the post”
For full instructions on ho to create your very own Binary Burst Clock, jump over to the JumpTuck website for details, component lists and plans.
Source: Hacked Gadgets : Dangerous Prototypes : JumpTuck