Rubber bands and hammering
This is fun way to steam out some energy while creating something to do. You need a piece of wooden board, nails, hammer and rubber bands. Hammer nails into the board. Try using hammer with small children too. There are no rules about how many or where nails go. Set rubber bands to the nails, create imaginary forms and do it all over again.
Can you create rules for some game? Is it possible to use some other materials than rubber bands?