I have some kind of special circumstances, so I have come up with the following:
My direct supervisor won't write for me, as I would leave the company upon matriculation, so I have worked with six coworkers and friends in writing for six schools. Some only wrote for one school, others wrote for up to three. As such, I want to give gifts somewhat proportionally to effort expended.
I am giving each person a shirt or sweatshirt to the school they wrote for (this is around $25-$35, appropriate) and in the end, once I am accepted, I will get each of the six a nice pen, perhaps engraved. I figure a pen is appropriate considering the nature of the task. It does feel a bit weird buying school-branded stuff before I am accepted, but I figure that since I'm not the person wearing it it's not as weird. I don't know if any of them will wear it, but the response so far has been good (better than with chocolates, which I gave to my Wharton recommenders).