I've got a great marinade for chicken, fish, and pork. Only drawback is it's high in sodium. As follows:
3 equal parts, lemon juice, red wine vinegar, and low sodium soy sauce. Marinate for 4 to 6 hrs.
Also, for un-flavored oatmeal, I found a scoop of whey protein(choc. or vanilla) is pretty good. It dosen't sound good but it is to me.