Check out this new article Wizards of the Coast posted recently:
D&D Miniatures: 3rd-Level Random Encounters
"So I called my mom, and I was all like, 'guess what?' and she was like, 'what?' and I was like, 'I'm a random encounter -- rarrr'!" OK, there aren't any gnomes on this RE list, but there are some pretty nasty foes to bump into.