Santoro "Popnrock" cards are a great example of paper mechanics and genius. Every card comes pre-assembled with a space to write your message and easily pops open from the packaging. "With a gentle nudge the cards rock from side to side and they all feature a number of small moving parts which sway in harmony with the motion." This innovative pop-up, 3D series of cards won gift of the year in the best Card & Wrap category. The cards shown above are designs - Teacups in Forest and Owls, to view the rest of the beautiful cards go to their website.
The video below shows the card in action.