Our mission: make something that does something. Not as easy as it sounds.
A 9-volt battery driving an LM317 power-supply outputting 5 volts, driving a tiny sliver of crystallized rock into resonance at one-and-a-half thousand vibrations per second, divided in half, 8 times, by a binary counter, down to a speed of about six vibrations per-second, driving an LED.
Meaning, we made a light blink 6 times per second. Then we added two more LED's for different blink rates. All without a microcontroller, arduino, or attiny. And i'm happy to say, not one 555 was used. This was my design goal (since everybody uses 555's for everything).
Here's how to do it.
(you may need to give the animated gif at the top of this page a moment to load).