What you will need:
Have kids gather all the pillows that they can find in your house into one room such as the living room.
They can then proceed to jump into piles of pillows, have pillow fights, or build pillow forts or pillow obstacle courses. This is especially delightful if one or both parents join in!
This boredom breaker doesn’t cost a cent, only one’s imagination.
Do use caution as you don’t want anything that could cause broken bones or broken glass.