Hi All, (especially the technologically advanced ones)

I've been thinking about what kind of special avatar I want to use once I have 50 posts, together with the appropriate reputation points, and I've come up with an idea that I like, but I don't know how to go about creating it once I'm ready. I want a photo of Olivia Hussey in Zeffirelli's Romeo and Juliet, specifically one in which she is wearing the dress she met Romeo in. If I find such a picture on the net, is it possible to make it into an avatar? If so, how does one go about doing it? Is there anyhting else I should know about specialized avatars? Thanks for being patient with a computer non-geek (is that word?

Thanks for any help,
Chacounne