Something I was making for Halloween. It has a potentiometer that you turn to switch the mode of the LEDs from flicker, pules, or solid. I used an arduino to program the ATTiny85. Ones I finished it I ended up giving it to a friend so I am not 100% sure on the capacitors. Anything close to 450uF should be fine and depending on the power supply you may not need them at all.
2 resisters (10 Ohms hook to LEDs and 470 Ohms hooked to potentiometer)