Been there, done that, got the blisters to prove it. What saved me was wearing my boots while doing chores at home, like vacuuming or just walking around. I also used a hair dryer on warm setting to soften the leather in tight spots, just be careful not to overheat them. After a few days of that, they molded to my feet pretty well. Don't rush it too much though, or you'll end up with more blisters.

Wait, hold up. You used a random image for an art showcase? I mean, idk, but that sounds like a major ethics red flag. Did you even try to find out who made the original picture? Because if you didn't, you're basically showing off someone else's work as your own. That's not just unsure, that's straight up wrong in my view. What were you thinking when you submitted it? Like, did you consider how the original artist would feel?

Oh please, tell me you didn't just trust those little plastic devils to behave on their own. They have a one track mind, and that mind is set on sliding around and ruining your straight lines the second you look away. A dab of your tile adhesive is the only thing that stops the mutiny. It's like herding cats, but the cats are squares and your sanity is the carpet. You basically have to glue them down for their five minutes of useful life before you bury them forever. So much for those fancy bag claims about 'stay put' spacers, right?