Since the non-postcrossing Global Forevers are circular and a bit annoying, I use 2 Forever stamps plus a 20¢ stamp (6¢ wasted - i suppose i could switch to 15¢ stamps...).
> It's a project that allows you to send postcards and receive postcards back from random people around the world.
To point out why USPS took note of them, there are unofficial Postcrossing tracking IDs recording nearly half a million postcards actively in transit from sender to receiver as of when I pulled that from their website a couple minutes ago.
I'll just so happen to be at the world stamp expo, so I'll be sure to try and check out the postcrossing meetups, and pick up some of these stamps hot off the press!
18 U.S.C. § 501. If you post high-resolution, printable images of valid stamps, especially unused ones, and they can be reproduced, prosecutors could argue you’re facilitating counterfeiting.