I've decided to post some projects about the 555 that I find are really fun and useful/ annoying. www.555-timer-circuits.com has more.
It is overwhelming about where to start...
Step 1: Gather the Parts.
A lot of 555 timers
A lot of jumpers
A lot of electronic components
Step 2: 555 Oscillator
A 555 can be set up in monostable or astable or bistable or as a buffer...Schmitt Trigger...mode.
Monostable means that no matter how long the pulse or how many inputs, at once, it will only output once. When it is triggered again, it will pulse again but only if it has a reset.
Bistable is a flip-flop. Basically, it will remain in one position until it is reset.
An inverter flips the signal. High is low, low is high.
Step 3: 555 Blinky.
The circuit above is as follows:
C1 = 100uF
C2 = Not really needed
R1 = Potentiometer of your choice
R2 = 1Kohm resistor
LED1 (Not shown in pic) = 470ohm then LED to ground
LED (Not shown in pic) = From positive to 470ohm resistor to LED