I had plenty of fluorescent lamp starters and I thought, if this is a thermal switch, it should give me the blinking random effect that I wanted.
And it worked perfectly! I tried with 3 starters and 3 incandescent light bulbs, and this was the result:
Obviously this is not gonna be good for the life time of the bulbs, since they are always turning on and off, it's a matter of time until they turn off for good. But still, it's a cool and simple trick.