The dragon sticker was printed. We brought it to Wikimania and handed it out. Also mailed a few of them to the student who designed them.
People generally liked them and we have some more left over to bring to future events!
Will have a few at TechCon and then also will bring them to Prague Hackathon.
I would love other ideas of "fun" stickers for students to design so I can continue to mentor this type of task in future GCI rounds.