Tomorrow, I'll try to experiment with multiplexing via transistors. I also need a few more 10K Ohm resistors and some switches, so there's another trip to Technica in the works.
I want to give the clock two modi: one that keeps time and another one which displays patterns. With a switch, you switch modes (Ha! didn't see that one coming, did you!?), and I will add two buttons: one to add to the minute counter and one to add to the hour counter -- but in Pattern Mode, it will switch between patterns.
If anyone has a cool, animated pattern that can be displayed on a grid of 6x4, comment, and your patterns shall be immortalised as PIC-assembly code!