I recorded a percussion track last week with three guys all playing "non-instruments." I played beat one by scraping a gooseneck on the Wurlitzer leg, hit a mic stand for beat two. The bass player hit the couch with a mallet on beat four. The drummer hit a brake drum with a drill bit on the and of four.
On a solo record I did years ago I did a whole piece called "found Sounds" which consisted of washboard, two office water bottles, nine brake drums and a kitchen sink (really).