The Deathly Hallows Fingernails
The souvenir shops around Buckingham Palace offered nail decals to celebrate the nuptials of William and Kate in April, but this Harry Potter Etsy shop offers actual fake press-on fingernails with Potter motifs. And they're available in the U.S.! The Deathly Hallows set is the best; it features depictions of the Peverell brothers, Death, and the Deathly Hallows emblem. Your other choices are Hogwarts house-themed sets of nails, but they could appear to a casual observer to just be a random green and grey pattern on some nails. With the Deathly Hallows set, even people who don't know anything about Harry Potter will know there's a story behind those fingernails.