Once you are happy with the freq of the blinking leds, you have to put the circuit to spin. Here we use a fan made with lego motors by Alecu. You can use a regular fan (be careful!), or make something similar with a motor and some gears. Just make sure that the circuit is tigth and securely fixed to the fan blade, cause the spinning tends to spit things out at a really high speed!
Check the video to see what we are talking about.