Here's another easy face scrub/mask that I made for myself the other day:
1 tsp polenta (cornmeal)
1 tsp plain yoghurt
1 tsp tahini (sesame paste)
Mix all ingredients together to form a thick paste. Spread onto clean skin, rubbing in gently, then leave on for 5 minutes. Wash off with warm water.
This scrub/mask is great for exfoliating and deeply moisturising congested skin, and is also a really good hand scrub. However if your skin tends to be delicate, sensitive or blemished, it might be too abrasive - use finely ground rolled oats or almond meal in place of the polenta.