I agree with both those suggestions. The recipe from Feeding the Whole Family is the one I use to make bread at least once a week. It uses 2 cups of cooked grains in the starter. Blend with 2 cups water, tablespoon yeast, tablespoon salt, 1/4 cup oil, 1 cup ww flour and let sit 12 to 24 hours. Then add 2 cups ww flour, 4 cups white flour and 1/4 cup sweetener, knead, rise again and then rise in 2 loaf pans. It's delicious.
I also think that you could add a cup of cooked oatmeal to pancake or waffle batter. Maybe puree it with the liquid so it incorporates easily.
You could freeze it in one cup portions and then use it as needed. I always scrape leftover oatmeal from the pan to save for the bread recipe listed above.
Or you could feed it to the dog in small amounts. : )