Okay...I want to go all out (but subtly) for someone who is Graduating in the beginning of August?

Someone whom I care about is graduating in the beginning of August, and I want to make something special for her. But the thins is is that I won't be able to see her at all...and the only way of communicating is by means of phone and IMs...but I have her mailing address and everything, and she doesn't know that I'll be sending something to her on her special day. She's getting her Master's, and I was thinking of making one of my specialty cards and then a big piece of something and putting together a collage of all the things she's done for me, leading up to her graduation....I don't really know what kind of gift a graduate would want, even though she's graduated several times already in the past. What would be a good gift, that's perhaps homemade, but still extraordinary enough to be a great present?