I’m mostly trying to think of mostly benign or positive fads, even if they might have inspired some folks to do wacky or dangerous things on the extreme edges of the fad. I’m thinking stuff like beanie babies or bedazzling stuff.
I personally want to see some of the fashion fads from the 70’s come back, like bell-bottoms.
I have a collection of hooded shawls which are the next best thing. I get compliments when the weather turns chilly enough to wear them. Be the change you want to see.