say hello to Limestone and Marble Pie, respectively
(aka, Blinkie and Inkie Pie)
a new book is being released, called "Pinkie Pie's Rockin Palooza", and the writer has confirmed these are Pinkie Pie's sister's names. now, in the show their names are still unknown. however, i doubt they are going to muck up something like this with conflicting names (if we see them again in the show). so it is likely safe to say that these are their official names.
