Just found David Browning's site with marvels such as these bad boys:
I do love pop up books. There is the most amazing pop up Pirate Ship that we sell at work which I actually gave to my little brother for Christmas last year. It's a lovely gift idea from Handpicked Collection and really went down very well. To be honest, I don't know very many four year olds who don't like pirates, treasure hunts and giant squids especially when they pop out of a book to be half a metre tall.