Use Bitaddress.org with Existing Wallet

[Razick]

Hi, this may be a stupid question, but I want to use bitaddress.org's art with an existing wallet. I don't fully trust the website so I want to use Bitcoin QT to generate an address, but I also want to have the pretty art from bitaddress. Is there an easy way to use an existing key on an offline computer and have it as a qr code on a bitaddress paper wallet?

I am slightly familiar with Javascript, so are there some particular variables I could fill in with my wallet details?

I would prefer to have the website fill everything in as opposed to using GIMP or something like that to do it manually for each wallet.