I've a habit of decluttering and throwing away stuff because I keep moving house and you really don't want to pack so much whenever and wherever you go. But since the kids came along, I'm a hoarder for stuff, not stuff for myself, but stuff which I can recycle to make toys for them. My husband is always nagging me about the 'pile' which is accumulating.
I begged him to let me keep 2 big cardboard boxes for the kids. They were from some IKEA furniture we bought so they're in very good condition and clean. These 2 boxes were literally my 'lifesavers', helping me to occupy the children in various activities, even limiting the messiness. Here are 5 ways we played with the cardboard box: