Often, the problem with the answers is that someone try to understand the sense of the question rather than simply answer the question
Ok, here's the reason: I want to make some gift for Christmas, and I have generated a lot of vanity address for every person (the nickname of the person is in the address). So, I would like to put their vanity address on a nice Paper Wallet. This should explain why I'm asking that. Of course I'll warn the people that receive the gift that I could know their private key (though I don't), and they should transfer the money on a new address.
Yes, I'll use the offline javascript, and yes, I know what I'm doing.

Ciao,
IlMao.