Pinkie Pie I customized the hair of by following this tutorial:
I've put a tiny bit of hairspray (not epic strong hold stuff, the weaker stuff) on my ponies to make sure their hair stays in place for a long time.
You would think Pinkie Pie would be the hardest to modify to make her look more like her show's appearance.... but out of her and Fluttershy (i only had 2 ponies) I found Pinkie easier
It may be because fluttershy's hair has those perfect flicks at the end... and mine just didnt want to do it QUITE close enough.
Anyway, i love my ponies
I hope I find the other mane 6 so i can customise them too.