You are right, it wasn't a joke. Actually, I wanted to make a Jasper/Alice picture at first, but then I found a great basic for Jasper, and then came the idea, that I should try and make Alice look like a fairy. I remembered the interview with Ashley Greene, where she said, that Alice is like the darker version of Tinkerbell, so this is why I chose this green color for her.
By the way, I would love to see your ideas, how you see Alice and Edward as fairies. I like these ideas, maybe Edward is more like a fairy, than a vampire.