Although I have to say, on the weekend, she entertained herself with a cardboard box, a doll and a piece of string for about an hour - not sure what was going through her head during the playtime, but she was having great fun!
DD got two very large boxes that I had office chairs delivered in last week and they're upstairs as her 'caravans' atm! She's gotten out the glue and bits of paper and decorated them with that and drawings. Hours of fun!

Her favourite box of toys is her craft box - it has scissors, glue, drawing implements, bits and pieces like toilet rolls and scraps and magazine pages that I find and rip out for her. She will play with that for ages, happily engrossed in creating something wonderful!

I too find that boxes that each contain different toys or types of toys work well, both in terms of helping her tidy up, play with one thing at a time and making things easy to find as the mood takes her.

Although after this article, perhaps I should put some of them out of sight for a little while!