I honestly have no idea what the pieces above were intended for but I think they would be perfect for a single stemmed flower. My guess would be that they are Corelle but they have no company marking on them. Have you seen anything like these before? I'd love some insight!
Below are two Termo-Rey by Brasividro plates which have the Butterfly Gold pattern. For more info on Termo-Rey head over to this site. I know it's sort-of a knock-off but I love the milk glass like material!