Here's a few thoughts based on what's been written here.

I found that we do better in our playroom to a few things left out all the time for the kids to choose from. Every few months take most of the stuff and put it away and bring out different toys and games. I think when they look at the same old stuff too long it becomes boring.

Whenever my kids say they are bored I would say that is telling you to use your imagination to come up with an idea. Let me know if you need more ideas.

I think this has something to do with why my son is a project guy. Ex. the kids came up with the idea of their own library. So they made several books and library cards. It was lots of fun.