Here is the same board after my 10 year old got finished with it. Kind of a green lady bug!
Here is an even earlier design after my six year old finished with it. I built it on a strip board, and it used an Attiny13 8 pin chip, which stuck up in between the wings (just out of sight in the picture). It had a flaw in that it drained the battery in only a couple of days. The newer designs last much longer.