http://okmij.org/ftp/Scheme/oop-in-fp.txt
http://stackoverflow.com/questions/2954642/methods-and-prope...
http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-20.html
Some examples. The first is a discussion on it. The second and third have examples in scheme. I'd type more but I'm on my iPad. If I get time later I'll steal time on someone's computer to type up more.