I did a little looking... & to answer your question are we the only one, no. But I'm not sure anyone does anything quite to the scale that goes on on bowman field. Lots of school do displays, LSU stands out to me for some reason and i did a quick google search and saw that Nebraska and a lot of smaller schools do some kind of display with the tissue paper thing. Also, tons make floats for parades or to drive their homecoming court around etc.
I think it's just like a lot of things that "eveyone does" clemson does it but with a twist and it makes it more unique haha