I like using up consumables that would otherwise be wasted, like soap, shampoo, single-sided printouts and the last crumbs in a packet of chips. I also have a weird affinity for sculpture or practical repairs involving found or free materials - rubbish that would otherwise be thrown out. When the grip on my micro-clutch pencil wore out, I wrapped several rubber bands around it to make a new grip. They came from several sushi lunches over time, and they would otherwise have been discarded.
I think our society is too wasteful, and if I were doing all this on purpose, it would count as an artistic statement and social commentary. As it is, I think it just qualifies as a type of hoarding.
Mokalus of Borg
PS - Also, I don't always get around to using the things I gather this way.
PPS - Which definitely pushes it into hoarding territory.