People often mock it, but this is actually one of the oldest American traditions -- specifically, predating the United States, and dating from Turtle Island. "The gift must move" is a fundamental premise of the gift economy. Who gives is rich; who does not give is poor. If you have things you don't need, give them away.
Upcycling is also an option. You can turn old things into new things that are more useful.
Did you get some stuff you didn't want over the holidays? Many of us did. Move it out or move it up!