Boredom Busters

Widening my search, I came across this parenting site with a reasonable collection of reasonless fun. Here's an example that caught my open-ended eye:

Turn an ordinary board game into a silly adventure in play.
Have your children gather pieces to a variety of games.
Using original rules of their own, they create, a unique game. Beware of subjecting yourself to these new rules…..
You could soon be "Colonel Mustard", landing on Boardwalk, paying the fee with your old maid card, while your opponent hollers out "BINGO!"...Unless, it's Tuesday, and the moon is full. Some children may need help getting this game off the ground...
Once they "get it" they'll have a ball !