Demo:
early test of features:
Its still a bit bright at night, so will look into dimming the display beyond brightness level 0
Using the HP bubble displays, a small, unobtrusive bedside clock, with day, date, seconds and (eventually) ambient light detection.
I built something similar http://www.instructables.com/id/Tnychron-A-Retro-LED-Bubble-Style-Display-Clock/ and figured out a nice way to mount the displays at the edge of the PCB. I'd stick with DS3231, as DS1307 drifts too much.