Sell them. They are collectable.

I have some made into candle holders. Turn upside-down, use copper wire to create a stand, stick in plant, add tealight.

I've also seen tons of good ideas for them on pinterest and etsy.

Wow! How cool is that? I've seen them just hung in trees....bunches in one tree. And, like everyone else here, I've seen lots of candleholder ideas. I think the one I like best is one where the person took a piece of tree trunk and hollowed out a trough and lined the insulators along the trough and used it as a centerpiece for a table. The insulators held candles. They also make good bottom weights (clangers) for large windchimes.

Sorry I didn't see the forum title when I posted. I found this on the right side of the screen on most recent posts.

I have some around the edge of one of my flower beds. Not the most creative use but they are pretty (green ones.)
Have fun and post pics of what you do !
Kathy

What a wonderful gift from your friend! Here are some things I have done with mine. Have the gray concrete block retaining walls that swoop downward so I put a random mix of colored & clear insulators on the walls, mostly 2 per block, used about 150 that way.
Used some on white picket fence, railings, mixed in between pots of annuals on porch, deck, tables, etc. Wired old rusty tiller tines (handle was gone) onto iron bed frame, put 3 insulators on the tines. Could do that on old lawn gates also. Nailed similar tines on a tree, used 3 insulators. Have 3 on a rusty hay fork. Wired rusty bale hook to lawn gate, holds 1 insulator. Put them in birdbaths. Found the enamel kettle w/rack I used to sterilize baby bottles (can't believe I still had that), filled the rack w/#9 size insulators, set the rack on old wooden furniture (commode) on deck. Have old wheel with iron rim & wooden spokes but center hub missing, blue insulator fit great in the center hole. Put them on a grouping of different lengths of rebar for vertical interest in gardens. My favorite thing is wooden spokes with missing iron rim (does have hub to hold it together), put insulators on end of each spoke (except bottom 2 that are on ground), just like screwing them on original telephone pole! Possibilities are endless, have fun with yours!

this is what I do with mine!! The kids call the the Sinester's.

I used several on sticks to put around my flowerbeds as hose guides. look pretty good and work well.

With 100 I would make them into a bottle tree, bird perch. That could be stunning.

Thanks for all the ideas. I plan to use them for a winter project.

windchime

How about putting them on wire upside down and planting them with small succulents? Maybe under an overhang that gets sun but not rain? Or in your kitchen window.

I've started lining my flower beds by the sidewalk with them. I also have a snail problem. :(