I made this for breakfast yesterday and realized after that it was Halloweeny. Purple and orange work well as festive colors. If you used blackberries you could get an almost black oatmeal. These were both leftovers from the previous day. I used the baked acorn squash recipe from Simply Recipes (sans syrup) and added frozen blueberries when I was cooking my oatmeal. I will have to repeat this with kabocha as well.