I've heard of some people drinking ginseng to feel more awake, while others say that adding a shot of wheatgrass to their smoothie works wonders.
Here's what works pretty well for me: the lemongrass and ginger tea from Pukka Herbs.
I'm a fan of Pukka teas in general, and this is one of my tops favourites.
I don't know if this tea would help you wake up, but, if your tastes are anything like mine, you'll at least enjoy the flavour. It has a certain zing, but not a terribly strong one. This tea is flavoursome and slightly sweet. Like all Pukka teas, it's organic. It tastes pretty good cold as well.