You have to tell people something really exists first! Only after that, if they express interest, you can tell them what it is really about. This is exactly what casascius bitcoins are - souvenirs! People just can extract additional value out of the souvenir (if there is a hologram sticker) if they understand what bitcoin is really about.

Casascius bitcoins is great idea. Just wondering, however, what would be the 'temptation' level for casascius to 'monetize' all unclaimed private keys and run away with money?