Since I go to Starbucks so often, I try as much as the menu as I can. Right now I'm taking full advantage of the Tiramisu Frap still, but I recently had just a plain coffee frappuccino.
It's the most basic frap, as it's just frozen coffee, and you can choose to put whip cream on it, but I believe that typically the barista will assume you don't. As it's the most basic, it's also the healthiest, as I believe a venti is only 250 calories. I like to have this option when I want to switch things up, or when I'm trying to be healthier but still want a frappuccino.
Have you ever tried the coffee frap?