I'm on the verge of an obsession with glass jars.
I found a bunch of old mason jars at a local furniture store (random, right?) They were only $2 each so I bought 8. Now they sit on top of my shelf in my “studio” (it's technically the dining room, but we don't “dine”, so I moved my stuff in.)
I've started a button jar and have a few scrap ribbon jars. The others are empty at the moment, just sitting there looking pretty waiting for a purpose. Some don't have the wire that holds the top on, but I bought some 12 gauge jewelry wire to see what I can do. I know I can at least make the jars into hanging lanterns like this tutorial from Brown Paper Packages.
Any other ideas?