The origami was first noticed by staff at the University of Wolverhampton, who saw the delicate paper sculptures throughout the campus.
The intricate artwork has been spotted in city subways and various locations near the university, prompting a search by members of staff and students to discover who is creating them.
The origami – which is the art of paper folding which started in Japan – was first spotted two weeks ago.
Designs of a penguin and a vase of flowers were found in the building opposite the Molineux, before more were discovered on window sills and in lifts, before disappearing shortly afterwards.
The university decided to put out a story on the staff intranet asking anyone to come forward who might have seen any other samples and Mags Winthrop, communications manager at University of Wolverhampton, also tweeted an image.
The following day a special delivery box was found addressed on a window sill containing a note about the leaves in the subway and two other samples.
The note on the box said: “Special Delivery #banksystyle Accident or vandalism? Picture of the one that didn’t survive the trip through the subway…RIP.
“If this was meant to go home with somebody and was lost by accident, Tweet @wlv_uniNews and you will receive a replacement in the next few weeks.”
Ms Winthrop said: “It was packaged beautifully so the person who is doing this is obviously very creative and very skilled.
“It’s a lovely idea to leave these little surprises around the campus, especially as the university starts to gear up for one of its busiest times of the year with A-level results next week and Clearing starting. There’s something really calming and lovely about the origami and the mystery person is clearly taking time and effort to share their creativity.
“We have no idea who it could be, but we’re all on the lookout for more. We’d love to find out who’s doing them, they’re clearly very talented.”
Do you know who is behind the mystery origami? Email email@example.com