What a great idea for old keys. Add a Chain and Glue an old earring, broken piece of jewellery , etc. your choice. Now you have a cool necklace, ( wear many at once ) . OR ( hang from bracelet, anklet etc ) Love this. I have lots of old keys.
A rope bracelet - reminds me of making friendship bracelets back in the day. My right second toe used to go numb because I'd hook the end of the bracelet over it, and then knot embroidery floss for HOURS.