I have a thing for boxes. Big and small and round and square, in bright colours and interesting patterns. Recently I discovered that I could make them myselves. To get them sturdy enough you generally need paper somewhat stiffer than regular printing paper. Old magazine-backs and -covers are a good alternative to buying cardboard and the boxes become more interesting as well. Used some in making of Christmas presents this year.
I have a specific plan for these boxes. If I can be bothered I'll post pics of the finished project.