The Wandering Post Card
Wheresoever you may roam, there is the Wandering Post; it is unknown how these cards find their destinations, but it's suspected that a network of will-o'-wisps has something to do with it.
Design features include a sprig of rosemary held in place by a Celtic knot wax seal, the Wanderer's Instruments in the upper left corner (illustrated by @silvanuscosplay, IG) on the correspondence side, and a mini print of local PNW photography (@mestitiah, IG) on the backside.
Printed on a pleasantly-sturdy, matte recycled stock. Measures 4" x 6", which is standard acceptable size to be mailed with the USPS, if you prefer human postage. Comes with a maroon sleeve for discreet mailing.