Color furniture with vertical rainbow stripes like this Zoe Murphy chest of drawers. You can try strips of coloured tape for a non permanent option, assuming you aren't like me and have the patience to rip off the tape carefully afterwards.
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.