This thread reminded me of these hot pads that my great aunt and many other women used to make. My Aunt would never use a beer bottle crown in any of her creations.
Today the old guys at the flea market buy them and cut out the crowns looking for old valuable local beer caps that have been preserved in good condition.
I imagine that in 50 years or so a future crop of old men will cry when they see these art projects and the valuable crowns that have been ruined in the name of art.
In the ghetto we called it "skellys" but it was also known as skully or skelly - we used bottle caps and tried to knock them into boxes in order to accumulate points.