I’ve created a Binary Clock using a FEZ Spider and various components. I’m attaching a picture. I’ve blogged about the process here:
I’ve also included the source code in the blog posts.
Hope someone else finds this useful and has a go at building one. I’ve got it on my desk telling me the time. It syncs with a time service over the network so I always know its the right time. And I get to do a little bit of maths each time