I just read an article that lists "5 New Ways to Use an Ice Cube Tray". It reminded me of some other ways ice cube trays can be used for food and beyond.
Small homemade popsicles: When I was little, I used to pour orange juice into the tray with toothpicks sticking out of each little cube maker. Use the juice of choice to make your little ones happy!
Flavored ice cubes: Put berries or mint into each little cube, cover with water and freeze. Use the resulting cubes to add color and flavor to your as water or iced tea as they melt.
Wine cubes: Got a little wine left over after dinner? Freeze it then pop out the cubes and store in a freezer bag. Then when you want to add a little flavor to a sauce, just throw in a cube or two.
Jewelry organizer: Put your earrings, rings or small pendants into a tray. Or use one for earrings, another for rings, etc. It's not high-tech, but it will keep your jewelry much more organized!