I don't share a ton of custom toys on the site because there are way too many out there, so much so that entire sites exist dedicated to it. This custom Lego set though was too cool to pass up. It's Joker's funhouse and it's the shit. It's by BrickBaron who I think we've actually featured before.
http://www.youtube.com/watch?v=95gUCiT_-A8