Ooh- I used to make one I that loved. It was ground up oatmeal, and then I added a little honey and some cream or milk to make it the right consistency. It worked great! A warning though: you'll have to wash your face over the kitchen sink, because it will clog the bathroom sink! Also, it needs to be stored in the fridge. Just make a little at a time - a few night's worth.
I love to whip up some egg whites then add a couple drops of lemon juice. It feels a little weird at first, just let it dry and then rinse off well!! I have combo. skin and it works for me- makes my skin so soft. Don't forget moisturzer.
If you puy oats in the blender for a few seconds they mix with water well for masks. Are you trying to dry up oil or moisturize? Oats will dry out dry skin too much. You can mash up avocado for a GREAT moisturizing mask.