@aaaaaa I wouldn't consider such a list of any use, and certainly I'd consider such a question too broad. First, many people don't usually give gifts for completing a PhD (in twenty years, I can't recall a PhD student of mine receiving gifts for this). Second, for someone who would appreciate a PhD-related gift, there's another one who would hate it and who would much appreciate another kind of gift.

@aaaaaa do PhD students ever want anything other than time, coffee, and chocolate?

Mmmm, chocolate...

@ff524 that is only because you don't have a thesis to write, otherwise time an coffee would have been more important.