A lot of Epic Mickey's early concept art ranged from slightly creepy to absolutely disturbing. I won't post any here because I'm a wimp, but feel free to look it up.
This is the most I could find.
[img]spookyscaryskeletons[/i mg]oh wow
half life's 0.52 beta is really weird, though. there are only 3 weapons, no story and the game has a really cartoony look