Sure! Well, I actually wrote that again in another comment, so I'll copy paste you what I wrote there: "Well, it's not that tough to do it, and it's lots of fun (though it does need a bit of patience!). Only thing you really need is a camera that you can keep her shutter open for as long as you want! Then in an absolutely dark room start making lines with a lighting torch, and voila! It's like drawing on a canvas! Just make sure you do not move the camera; place it on a tripod or somewhere else still. "
And for a complete tutorial on how to do it, I found a very useful page that will help you a lot: [link]
"Well, it's not that tough to do it, and it's lots of fun (though it does need a bit of patience!). Only thing you really need is a camera that you can keep her shutter open for as long as you want! Then in an absolutely dark room start making lines with a lighting torch, and voila! It's like drawing on a canvas!
Just make sure you do not move the camera; place it on a tripod or somewhere else still. "
And for a complete tutorial on how to do it, I found a very useful page that will help you a lot:
[link]
Do try it, it's really great!