I've got a pretty spiffy ham QSL card. It's basic, but it does have a retro-action color glossy pic of me up to my ass in alligators trying to catch a mullet. It's on the funkier end of the the run of the mill QSL cards. Chat with me on HF, or just listen in on your shortwave and email me a signal report sometime and I'll be happy to send you one.
But this one discussed over at the SWLing post is in a whole 'nother league. Color images, sure, but audio? On a postcard? With digital signals encoded in the audio? Holy smokes!