7-Segment Display

I made a 7-Segment Display that can count up. Here is the project: http://www.planetminecraft.com/project/7-segment-stackable-display/.
I wanted to know if some people would ahve suggestions on what I could build with that. I a;ready planned a clock (It can be second accurate easily, I already tested), a real counter and a timer. Any other idea?
Thanks for taking the time to read