Usually it's a premixed bag of frozen broccoli, cauliflower, and carrots...broccoli is my favorite out of those three though.
Hard not to feel like a giant when you're looking down at miniature trees on your fork. xD
...now if I had things my way, it'd be a big pile of canned spinach, some peas, and a bunch of frozen broccoli.
Of course, I'd have to save a little room for some grilled chicken breast too. *w*