These cubes work in so many different drinks. They absorb the flavour of whatever they're floating in - my favourite combination is frozen watermelon and lemonade. The watermelon at the end has that sweet lemonade zing and I can't even. They also go great with Vodka mixes, fruit juices, and it adds a refreshing hint of sweetness to water, too without adding masses of calories.
Or, you could just eat the frozen cubes on a hot day - you're not going to be disappointed either way. I promise.