I was just looking through this website and reading a list of things to do with kids indoors other than tv. One of the suggestions was NOTHING. I like the writer's point. :) Not that it's one that can be used all the time. Though I more than suspect this is often used by a lot a parents already. Just not so strategically.
"Boredom is good for kids. Children are seldom truly bored; they just haven't excercised that part of the brain that uses their imagination. Make a rule that if your kid announces they're bored, they'll have to do chores. So if they truly can't think of anything off-hand to do, eventually they'll think of something.
It's a good lesson to learn that life is not always entertaining, and that they're not the centre of attention. And if you've got a typical home, there's actually plenty they can do. So don't feel like you always have to provide options and events for your children. They'll be just fine exercising their brain."
Check out the other ideas listed here.