Thanks for all the useful info so far. I want to brew soon, so spruce is out of the question since it is winter (I think). Orange peel sounds like it may work. What I am going to do is try to brew a batch out of just common ingredients that I can get at the store or find. I am looking at Grape Nuts as a grain option because one of the ingredients in it is malted barley. I am still wondering about things like flax seed, wheat germ, and other kinds of cereals.