I just sealed up an envelope full of stuff to send Dave. Nothing huge because I can't afford a lot of postage, but decent enough. So I'm going to do what xrunner did and give you a hint. I'm not going to say whether you're right or wrong, because that would spoil the surprise, but it might be fun to see what you all come up with.
The hint is the picture below.
Even if you figure it out, there are a few items, so you'll still be surprised.