call me crazy, but I will buy those Nori (roasted seaweed) packs that you'd use to make sushi and just eat the sheets by themselves. 10 calories a sheet, good minerals, and they give you something to eat. They don't fill you up, but if you're like me and just always want to be munching on something, they're pretty wonderful.
Other things I enjoy:
-fruit
-homemade hummus with carrots (super easy to make with two cans of hummus (one with juice, one without), a clove of garlic, 1/4 cup of lemon juice, a teaspoon cumin, a tablespoon olive oil, a dollop of peanut butter, and a blender!)
-green beans
-unsalted almonds