Well, I did a huge chalk drawing on a sheet of tiling backer board for an art contest once over a decade ago and ended up looking like a smurf by the end of it.
The fact that chalk is as messy as it is is a huge part of why it's so fun to play with, chalk is basically like dry fingerpaints, at least if you forego the blending stump.
But yeah, the biggest messes I've made in recent years are any time I've gotten my chalk out to play with basically.
Beyond that there's playing in the mud when I was a really young kid and still living in Washington state at the time, and the countless glitter crafts and stuff I did in school growing up like pretty much everyone else in here has probably done.
PS: I hope I'm not the only one on this thread whose messes are normal, and just part of, and IMO the fun part of, making physical art or crafts in the case of my chalk art story. Like, I've come across some screwed-up stories on this thread and mine seem to be the most normal of the bunch.