thx everyone for comments and guesses!
I was going to tell you all what it was yesterday but I was too busy.
ANSWER: It's the bottom of a big metal (aluminum?) cooking pot. I was cooking pasta the other day and forgot to turn the stove off (bad, bad, bad). I turned the pot over and saw those black flakes that looked like paint peeling off and the copper with all those beautiful colors.
I wonder though, if anyone thought these looked like some kind of skin disease...lol. someone did at another forum. kind of does, too, especially the 3rd one that's out of focus.