Japan Trend Shop is selling these galaxy envelopes. Once your recipient empties it out, they look into the envelope and see astronomically correct constellations. Very cool! A set of 5 will cost you $83 though, so maybe just grab an envelope, stab a bunch of holes in it, and send it on its way. Sure, it won’t be “astronomically correct” but it will not cost you $83. So there’s that.