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I don't mean to take sales away from Toren's beautiful work, but while we're on the topic of switchplate covers there is an outfit in Colorado that sells beautiful ones cut from fossiliferous limestone from Pakistan. They cost about $8 and my fiancee and I buy a bunch whenever we're at the Geological Society of America annual meeting where they have a vendor display. I can't find any pictures of the plate covers, but you can see what the rock looks like in this (lousy) photo from their website(the limestone is on the right): mortars and pestles in limestone and marble