For this, I use:
a hot knife
a dremel
cardboard or something to put my bits against when they get covered in plastic
ponies
boiling water
resin or apoxie
a watertight glue
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First we start the way we do with all g4's, boiling them and taking their heads off. In my case I'm rehairing Celestia so she gets a haircut too.

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 the winged snow globe ponies need a little additional boiling to get the glue on their wings to loosen so you can take them out. The tail will come with them.

After that, I took a hot knife to get the wing attachments out. There's a hard plastic rod holding them in along with glue, so you have to cut along both sides to the top of the attachment.

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 Celestia's wings are similar. they have two shelves that keep them in. Cutting along the opening where that shelf is will free them.

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 We now have headless, wingless glitter ponies!

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 Celestia gets to have two holes drilled into her. one is in her neck and is where I put in and take out the water. You have to be careful if you plan on having a head that moves. The entire plug will melt and often come off. you can combat this by taking breaks every few seconds or if you have an attachment that allows it, drill it in water, like you would a precious stone. On that note, be careful when playing with these ponies in general and molten plastic is hot and often what you get when making holes.

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 the second hole is in her front hooves. This is to get the glitter out and in. For the snow globe wings I make one hole in each wing that looks a lot like this one.

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 after you get the glitter and not really water out, this is what we're left with. From here, personalizing is a lot like other ponies, except that Celestia's body will react badly to acetone. If you can put it only on the cutie mark, and only sparingly. Or, just paint over it.

I haven't taken photos of the finishing process but I'll try to explain it to the best I can. Celestia will get new wings out of a mold of my own which will be sealed in with resin. On Tinkerbelle I got the tail out by cutting away the barrier between the wings and the rump, I don't suggest that. Everything I was trying to seal in ran down her tail until I noticed and plugged it with some silicone. This time I made the tail hole bigger.
Next plug the neck hole with your finger, put the glitter in along with a table spoon and a half of glycerin (more or less, it doesn't so much matter) a long with some water. Make sure all of this ends up in her back hooves or as close as you can get it.
The next part is sealing her hooves, you can use apoxie if you don't need the translucency. If you do, you can make a mold for resin out of pretty much anything. I have monster clay, but you could use duct tape or another clay so long as you put  wax paper at the bottom.
Once everything is sealed, fill up the rest of the pony using the neck hole and a lot of patience. the neck hole is small so it takes a while for water to get in. You can try to add more glycerin here, but I don't suggest it, since it has a higher viscosity.
last, use something to plug the hole. If it's apoxie just stick it in, or if you can find something clear (I use clear silicone) to plug the hole and then put e6000 on top of it. I suppose you could also use a low temp hot glue gun.


For the wings, it's a little easier. Put glycerin, water, and a plug in. glue it shut, then reglue it to it's holders. In my case, I'm actually putting lights and feathers in instead of water so I just need to make a channel for the cords in the holder and glue them back together.