Jewellery. It's been important to us for many thousands of years: I was watching Janina Ramirez's Raiders of the Lost Past last night, and it featured the skeleton of a child, discovered in the foundations of a five thousand year-old city in Turkey; round her wrists were two little bracelets made of beads.
I'm sure you have a collection, large or small. Choose one piece, describe it, and write about it - how you acquired it, what it means to you, what memories attach to it.
Or, if you'd rather, write a story that centres on a piece of jewellery.