Interestingly seen on a recent episode of Dragons Den were a brother and sister promoting their skin care company that used coffee grounds in their products? Here is an extract from their web site:
Natural, sustainable and handmade in the UK, Optiat create skincare products from quality ingredients that would otherwise be discarded. We provide ethical alternative o toxic beauty staples, such as micro beads, by using coffee grounds and other natural by products otherwise sent to landfill.
Welcome to Optiat, the nature-friendly skincare company. We take quality ingredients that would otherwise be discarded and transform them into natural, sustainable skincare products. Our products are hand-made in the UK and vegan-friendly, using only plant-based ingredients. We believe in respecting nature around us and will never, ever test on animals.
Check out - https://optiat.com/