I have always loved 3D cards. Especially the ones that use lenticular technology. The '70s and early '80s Kellogg's cards were my favorites... Until I saw the 1995 Fish Flix Herring Team insert cards. Wow! The fish seem to boomerang right out at you!

TBCB Muppets - #12 Lew Zealand

(I would recommend looking at this card in full size to get the best view. Click on the pic.)

 
Design based on: 1995 Sportflix Hammer Team #HT1 - Ken Griffey Jr