Here are some tutorials I have collected around the internet that I feel are exceptional enough to share with you folks.
Fairy Wings- How to make fairy wings using fantasy film and wire.
Butterfly Wings - Similar to the above tutorial, but different and stunning!
Flutter Pony Wings- How to make replacement flutter pony wings.
So-Soft Ponies - How to flock a My Little Pony to create a So-Soft version of the pony.
Hair Styling- A primer on basic My Little Pony hair styling techniques.
Hair Styling: Buns and Twists - How to do fancy pony up-dos with straight pins. I don’t agree with cutting the hair, but the basic idea with the straight pins is sound.
Gradient Hair Dying - How do dye hair in gradient colors. This produces a soft blend from one color to another.
Alternate Hairlines - This is a work in progress and could use more submissions! Patterns to make alternate hairlines for your ponies.
G4 Customizing - This walks you through the entire process, from prepping your bait, to decorating and rehairing it.
Colorscapeart’s Creations - Not a tutorial, but a great resource for figuring out bait poses, and ID-ing ponies. Also has a rarity index and a hair color match chart.