My mom bought me a Twist'n'Sparkle, a small soda maker that makes about a liter at a time. I've been experimenting with simple syrup recipes and my favorite so far is one infused with rosemary. Unusual, but good.
Next up: mint. My window plant is exploding, so if I don't get around to creating an occasion for a mojito, I'll make a mint-flavored simple syrup next.