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My icon is this Roman die, which sold at auction in 2003. I've definitely seen other people who made icons based on the news stories that came out around that time! I found a couple of similar artifacts while I was poking around for this one's provenance: here's an earlier Roman Egyptian icosahedron die in the Met, and here's a collection of Roman bronze dodecahedra with an icosahedron.
I usually use this icon for math or rpg posts, though I suppose it would work for classics posts, too.
Comment if you would like me to ask you about one (or more) of your icons!