Here is the current version (I think it’s the 4th) of my Extra Large Octangular Business-cards.
They are approximately 1.5 times the length of an ordinary card, and easily twice the surface-size. The idea is for them to stick out and not just disappear within a card-holder.
For comparison, here is the first version from ~1.5 years ago
This is the first time I’ve seen them side-by-side, actually. I like how they’ve gotten more stream-lined, but still follow the original idea :)