I hope you haven't thrown away those old ice cube trays. You may have used them to freeze coffee for iced coffee, or cubes of juice for punch. My favorite is to use the trays for vegetables. For example, I like to run zucchini through the blender and then fill a tray. After the cubes are frozen, I pop them into a bag and they are ready to add to soups for extra nutrition.
I also blanched kale and Swiss chard this summer and have cubes to add to potato or vegetable soup.
In the above photo, chopped green and red peppers are covered with water before freezing. It is so handy to reach in a bag and grab a cube or two for chili and other recipes.
Don't you just love to reuse and recycle?!