If I were an art teacher...

I'd use these two sites in a lesson: (1) Classics in LEGO ; (2) Far Side made real.

Since I'm not an art teacher, I can't offer a sound pedagogical justification for why I'd use those in a lesson except to say that I think "imitation by variation" is a great way to start learning stuff. I guess you can think of it as the equivalent of an English lesson where students rip off Holden Caulfield's voice while writing their own stories. Also, I just think those sites are pretty cool.