Would it be a violation of one of the thirty-nine melachos if someone made a paper airplane or made origami creation on shabbos? (And I know a melacha is loosely translated as "creative work".)
Rabbi Shlomo Zalman Aurbach, zatzal, prohibits making toys - like a boat, or hat - by folding paper, since it is like making a utensil. However, if the paper was folded into a toy before Shabbat, it is permitted to use it on Shabbat.
Shemirat Shabbat Kehilchata Ch.16:19