You obviously want something interesting. You don't want some ****e like this:
What does that say? "I think of you like my grandmother"
Not the message you want to send out.
And it's far too early for some romancy crap like this:
So it has to be something in between.
Your choice will say a lot about you, but also about your understanding of her.
If she is a more traditional type, maybe the first one is right up her alley. But if she's at all advanced (read: she owns an iPod), she'll like something more fashionable/contemporary.
(obv not too much yellow, you don't want her to think you're gay)