Sprinkle the cooled grounds right on to the ground of outdoor & indoor plants. The grounds will give a slow-release of nitrogen that will help fertilize your plants. Plus it will help keep slugs away. And cats do not like the coffee grounds and it can help deter them from digging in your indoor plants.
You could also try making some coffee grounds playdough.
Another thing you do with both of these kitchen scraps is to add them to your compost pile. Don't have a compost pile, then please read my latest post on Northern Cheapskate "No Stress Guide To Starting a Compost Pile".