i've gotten rubble the last 6 boss fights. it'd be less annoying if they were at least worth clean up points. If they have no purpose, then it feels more like a slap in the face.
Make walls. Use your imagination? Drop it on the ground if it affends you.
I used to spell Allen with water barrels around the world. One on top of Lord British castle lasted forever.
I gather the pieces and make a prison for the Allens after the event.
There's a ton of old stuff that doesn't have cleanup.
It's beyond time for a cleanup revamp with some fresh rewards.
Just drop it for people who enjoy it. In 5 years when someone decides to collect it you can sell it