Etsy is a wonderful repository of all of the most talented crafters around the world. Most of the time you might not be into that sort of thing, but we're going to go out on a limb and say that your girlfriend probably is. Hand-crafted gifts, even if you didn't craft them, still come off as more thoughtful than most of the generic Valentine's Day gifts that crop up in major stores every year. Etsy will also help you find something much more relevant to her interests, so use this to your advantage.