Not sure about the piece bit it reminds me of the Foulard pattern:http://www.pyrexlove.com/in/vintage-color-patterns/foulard/
Looks like Foulard but nor sure....It might be one of those weird never hear of pieces.Now are you a member of the Pyrex Love group on Flickr? Those folks would be most helpful!
foulard!!! you guys rock!! i googled and found pics of foulard in blue, red and even black, in addition to yellow. the yellow and blue i saw were mugs and the red and black were bowls like my yellow ones.thanks SO much!!!