So, this doesn't deserve a whole version number tick, but I didn't want to wait for enough other new stuff... I sure hope the Versioning System Police don't come knocking. Open up the Messages window. Try hitting "," or "." on your keyboard (comma or period).
Muahaha! If you hit comma enough times to make the images disappear, it will also hide the site logo and page title - a "public space safe" version of the game. It doesn't modify the text, of course, so you'll still get caught if someone is reading over your shoulder - but it's a hell of a lot less incriminating than the images would have been. ;)