I try to save glass jars to keep leftover bacon grease. Once your grease has cooled, pour it into the jar, seal tightly and keep in the refrigerator until ready to use.
Sometimes I like to smear a little bacon grease on potatoes, bake as usual (with or without foil) -- delicious. When growing up, my mother always added a teaspoon of bacon grease to green beans, then let them simmer for about 15 minutes. I do that, too, sometimes -- especially during the holidays.