My mother apparently ordered these two sets of pins at the same time that she ordered the Gnomeo & Juliet cd for me, but they came in separate packages. They were really the last thing I expected when my mother was going through the mail, and said "oh, hey, here you go" to me as I was standing there. Very cool choices though.
As to the Corruption of Mothers, she told me later that she picked the one with the cat in it simply because it's got a cat, but knowing my mother, I figured that. What amused me to bits was that she said she ordered the other set because she recognized the characters. While I doubt that she'll ever be one to watch an anime, or flip through a manga with me, I think it's really cool that she picked those pins for that reasoning.