These are Star Filled Envelopes. They're envelopes that, when opened and held up to a light source, reveal deez nuts. Wait, that can't be right. Oh -- they reveal "an astronomically-accurate group of constellations." You can buy five for $83 HERE or get them $10 apiece HERE. They're perfect to send to a friend who lives somewhere that doesn't get a good view of the night sky. You know, like in a big, bright city. Or in a castle dungeon. Send help please the king is gonna feed me to a dragon.
Thanks to Rebecca, who's holding out for a sun envelope that blinds its recipient.