From vegetable to apricot, you can find lots of tasty juices in a can. They aren't only for drinking, either. Both tomato and vegetable juice are used in lots of one-dish meals, like roasts and stews, and having a couple of cans on the shelf will open up some interesting possibilities.
How about making your own summer cooler with peach nectar and pineapple juice? Or you could turn that ham glaze or sweet and sour recipe into something divine by adding just a bit of pomegranate juice instead of water. Once you have a few canned juices in your inventory, you'll be coming up with lots of tantalizing notions about how to use them. Who knows where your creative instincts will take you?