Spice racks aren't just for spices. This one holds a collection of vintage office supplies. Spice racks can also display paints, rubber stamps or other art tools.
A metal grain scoop works well for displaying vintage wooden rulers.
Many artists buy thrift store Scrabble games for the letter tiles; here's another way to use the wooden racks. They're perfect for displaying small collections. (These vintage watercolor tins kept falling off the racks, so I put a dab of BluTac behind the tins to keep everything standing.) Scrabble boards can be cut down to make cute repurposed journal covers, too. ALL the contents of a Scrabble box can be used for art projects!
I'd love to hear your non-traditional storage and display ideas -- please share your ideas in the Comments!