I have a recipe for Oatmeal Milk. I don't know if that's the same thing or not, but here's the recipe anyway.

Oatmeal Milk

1 banana
1 cup cooked oatmeal
2 cups water
1 teaspoon vanilla extract (optional)

Puree all ingredients in blender or food processor until smooth. Keeps in the refrigerator for 4-6 days.

I got that out of a vegan cookbook I have. You might try picking up one. They have recipes for soy milk, rice milk, almond milk and coconut milk also. Let me know if you're interested.