Owlvamp, Another alternative to a 2 1/2" swap is a 5-inch "small scale" swap. Swappers would need to make sure their charms were dense with images, though. That way those who want 5" charms still get them, and those who want smaller can cut their charms to 2 1/2" and get 4 out of each block. That's what I did with this last swap. It worked great because I was able to keep a 2 1/2" charm for myself, and use three others for books.
Here are some great examples from my LQS:
And others cut from your most recent swap: