Yeah, I guess you could mess it up. I've made it so often throughout the years it seems impossible to ruin it.
I like to add almond extract to it.

My sister used to make what she called cookie dough oatmeal. She would add blueberries, maple syrup, almond extract, raisins. My teeth hurt just thinking about it. I used to call it garbage outmeal; it seemed like she was cleaning out her fridge each time.