So here's a thing I've been toying with lately, seeing as I realized that if I ever were a card-carrying anything, a Snape fan is surely it. (This isn't something I plan to make copies of and distribute, just for my personal amusement. NB this is not the full sized file for printing.)

The artwork is this (although I haven't 100% settled on using this piece):

Break by *Vizen on deviantART
The bottom text is upside-down because this would be cut out and folded in half along the edge to make a double-sided wallet-size card. It reads:
This card permits the bearer to:
Develop crushes on anyone with black hair and a big nose, proclaim the superiority of Potions and/or Defense Against the Dark Arts, use the word "Snapeing", billow, collect umpteen cauldrons or bottles, name precious things "Severus", be rather annoyed with Dumbledore, have a polarized opinion on Alan Rickman, find sarcasm to be the highest form of humor, cast Sectumsempra and Levicorpus, snark, sneer, snoop, sneak, and otherwise abuse words that begin with "sn", use the name "Sev", drink elf-made wine, practice Occlumency, scribble in Potions books, and generally
adore Severus Snape, the Half-Blood Prince.
(After all this time? Always.)

The artwork is this (although I haven't 100% settled on using this piece):

Break by *Vizen on deviantART
The bottom text is upside-down because this would be cut out and folded in half along the edge to make a double-sided wallet-size card. It reads:
Develop crushes on anyone with black hair and a big nose, proclaim the superiority of Potions and/or Defense Against the Dark Arts, use the word "Snapeing", billow, collect umpteen cauldrons or bottles, name precious things "Severus", be rather annoyed with Dumbledore, have a polarized opinion on Alan Rickman, find sarcasm to be the highest form of humor, cast Sectumsempra and Levicorpus, snark, sneer, snoop, sneak, and otherwise abuse words that begin with "sn", use the name "Sev", drink elf-made wine, practice Occlumency, scribble in Potions books, and generally
adore Severus Snape, the Half-Blood Prince.
(After all this time? Always.)