Disclaimer: This isn't so much a "tiny hack" — a tag we at Lifehacker use for simple tricks — so much as a "tiny pleasure." It's something that I do every day that makes me happy. It doesn't improve anything except the flavour of my mornings, and everyone should give it a shot. (That's an espresso pun right there.)
So here's my tiny pleasure: Every morning I pour myself a cup of coffee, and add in a splash of milk (or any other similar liquid, dairy or non), and I don't stir it. I get to watch the beautiful cloud-like pattern swim through my coffee, and don't need to worry about how many days in a row I've used that spoon without washing it. Best of all: Every sip is different. Sometimes the coffee is almost black, sometimes it's half creamer, and that dynamic flavoring is a great way to perk up first thing in the AM.
I would venture to say it is the morning-beverage equivalent to tasting a glass of California Cabernet before and after you've let it breathe. Take a sip and think about how it has evolved since your last sip. Now you're not just using coffee to deliver caffeine into your system; you're getting your brain moving and thinking, which is really the best part of waking up.