Freelabs Binary Clock is a clock that displays the current time in binary/decimal using a LED display. It really doesn't serve much of a practical purpose, unless your goal is to display the time in a strange format. Emphasis has been placed on making the clock cool looking and realistic.

There are some features and useful options that might interest you:

Binary Clock Features
LED and Background Color
Intuitive Interface
Time in 12 and 24 hour format
Time Display Mode: decimal and binary
Labels for each row of LEDs
Hide window to tray
Transparent background