Apart from the Pizza hut puppets (which are very regularly offered at ebay) there are a couple of other examples of "blue and pink Petrie". He was pictured in this manner in the 1988 Illustrated land before time book. I also have a Petrie plush from back then which is held in those colors. I don't know why this other version of Petrie existed, but for some reason Petrie seems to be the most frequently "disfigured" character. Many of the newer products bearing the "land before time collection" seal (and even some of the covers) sport what has often been called the "bat version" of Petrie. That version has him with a few hairs on his head and his neck, with bat-like wings (rather than the accurate wings supported by one bone only), a crooked beak, and broad eye circles.
Personally I really dislike that way of picturing Petrie as he looks not like a kid but like his great grandfather might look in case he had undergone some really messed up surgery.