Use a swivel hook to make a fob: insert ribbon, fabric, leather, elastic or other decorative cording/strapping through its loop, and then use the hook part to hang it from bags or belt loops.
Use a swivel hook to a make a lanyard: insert ribbon or fabric through its loop, and then use the hook end to hang ID tag.
Use a swivel hook to make detachable straps for bags and totes: sew a swivel hook onto each end of the bag strap (belting or fabric will go through loop end of the swivel hooks); attach the strap to rings on the bag/tote using hook end of swivel hooks.
Use a swivel hook as a key chain: attach jump ring with keys on it to loop end of swivel hook; use hook end of swivel hook to hang keys.
Small parts. Keep away from children.