Can you think of other ways you could include a pop-up like this on a greeting card? How about making a frog with a stand-out head, a boxer with a springing glove, or a bobbing birthday cake? You can probably think of lots more ideas.

You could make the paper spring in the same way as for the pig, and just change the design on the card. Or you could design a completely new kind of 'spring', using a piece of sponge, for example.