I saw a show on the food network where someone did coffee bean/orange infused vodka which turned out to be an amazing liqueur. After that I became addicted to infusing vodka. It's simple, tasty and easy to impress friends. I'd also say if you were to make these infused vodkas and give them as gifts you'd have a ton of new friends.
Being a hot head, I made this chili infused vodka because it's vital for a good Caesar. In Canada we have Clamato, a tomato and clam juice, which when mixed with some vodka and hot sauce (and other ingredients of course) becomes like this spicy Bloody Mary. You can add whatever else you like; I find a little Worcestershire and salt with the Clamato works great.