This is maybe the coolest thing ever. It's simple - just freeze the white inner core of the mug. Return the frozen core to the shell and pour in your favorite drink.
There's something about clear glass mundane items like this unsealed ziplock bag vase and glass water bottles and milk cartons that I love. It's one part art and one part functionality that equals perfection.
Freshen up your mouth while picking your teeth with these cinnamon flavored wooden toothpicks.