In a 1 gallon zip-lock bag I mix: 4 cups quick oats, 1/4 cup brown sugar, 1/4 cup wheat germ, 1/4 cup oat bran, and 1/2 cup shredded coconut. I then take out servings as needed, and add a few raisins to taste.
I also do the smoothie approach on weekends. In a typical smoothie I put: vanilla whey protein powder, non-fat milk or soy milk, 1 heaping tbs flax seed, a banana, 1/2 cup or so of brocolli, and ice. I have a vita-mix which blends it up nicely. I know, the brocolli sounds gross, but my kids sure like it (2 y.o and 4 y.o.).