Intro: Block Letter Clock
These are pictures of a custom clock I just made for my son's nursery. You could probably create the wood blocks yourself and repurpose and old clock but I just ordered them from Craft Cuts and Klockit, respectively. Just make sure you buy a high-torque movement and plan out the location of each letter at 30 degrees.
The entire cost of the clock the way I made it (letters and shipping, clock movement and shipping, spray paint, etc.) is about $90.