For content, I usually leave pamphlets and other printed Discordian bits from this site. I typically print a few things before a trip, and leave the reading material in airport, hotel, and sometimes national park public areas. Because I figure a bunch will get tossed by a custodian, I also try to put some in the "activities" displays - like the ones with brochures for local attractions. There's probably a lot of places you can leave a few bits of propaganda. I'll be including the picture trick.
I think it's really cool that OP found something. I have been looking for a decade.
I think it's really cool that OP found something. I have been looking for a decade.