A Pokémon-ish twist on the 'magic slider' card mechanism. Kecleon seemed to be a perfect match for this effect, although the tricky part was getting its red zigzag in place. Everybody who saw this card was amazed by the trick of a simple outline changing to a fully-coloured picture.
This card is a little plain, but was completed under 1.5 hours for a friend's birthday. If you're interested in making one for yourself, google 'magic slider cards' or try this site
for a tutorial.