I only have G4 ponies but I have a few.girls that come to mind! Some I swear must be related....
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(http://s1205.photobucket.com/user/larsa_richins/media/CAM03204.jpg.html)
Pinklestia and her love child Star Dreams LOL
It has been confirmed several times that Lauren based Fluttershy on Posey, not just in looks but her personality is close too (though Posey wasn't really shy, that was added due to Lauren's own shyness).
Now Strawberry Reef thinks Fluttershy is based on Posey and G3 Fluttershy but I'm pretty sure Skyskimmer/Butterfly was inspiration too.