Bread wrapper clips are still in use in the US, for both purposes.
YOu can also get a truly amazing sound from an autoharp if you get someone else to chord it, and play it percussively (as in drumsticks) with two fairly lightweight metal knitting needles. Or set it on the table and use one, and do the chording yourself.
There's also a performer around here (Scott Huckaby) who plays the surface of his guitar (squeak, squwaaaaaa)by slding his thumb along it, plays the strings above the nut, plays the strings above and below the slide, uses the body percussively with both hands and pick, and finally has his instrument partially filled with something (plastic beads maybe?) that makes it sound like a rainstick when he dips the peghead downward. If you don't know this (never saw him live) the music sounds surprising ly normal.
Blessings,
Barbara