I have lots of children. They have lots of toys.
They still get bored.
So every once in a while I whip out some stale cereal and pasta and set them to work.
Yes, that is my son doing yoga on the wall.
Painting is optional and probably best for the 5 and up crowd. Assuming, of course, that they're doing this so you can get something else done. Like laundry, or schoolwork.