I did this a while ago for a potential part of a project. I was playing with something I thought was going to be boring but ended up being a lot of fun. I saw this technique first from Duncan Brinsmead but didn't think too much about it. After you get whats going on, its a great lesson in reflective surfaces. I suggest giving it a try. There are example files on Duncan's AREA blog.
I did many more tests but these are just a few selections of ones I liked for various reasons. They kinda clash when put together like this but oh well. hah.