Whenever we get something that comes in a big box I keep the box for a while (in case of a return), then when the kids say I'm bored and I having nothing planned to do, I let them have at it. They get crayons and color the inside and pretend they are lots of things. When the box is hammered or when I get sick of it, which ever comes first I just recycle it. This box was their "house." Even Tiny T was loving it.