This is kind of fun. I buy blank boxes from the hobby store and paint them.
I store drawing pens, mechanical pencils and erasers in this box:
I altered the inside of this box to make a little tool box. I glued some leather strips to the inside of the top to store a set of tiny pliers, cutters and rulers. I put in dividers on the inside to store exacto knives, little saws, hammer, exacto blades, etc.
In these boxes, I keep a construction set that I bought at a garage sale:
And in these boxes, I keep my silver and gold collection: