It's your lucky day, because someone uploaded Meta's alts from the Prima eGuide on the Super Mario Wiki. (Not every character's swaps are uploaded there.)
[spoiler]
Dark
Gray
Green
Pink
Purple
Red
White
[/spoiler]
They aren't transparent, but that's easy enough to fix with a masking layer. I'll do those in a bit.
Edit: Done. Not quite as easy as I had thought because the basic palette PNG was a sloppy edit, not one from the press kits, but not too bad.
[spoiler]
Dark
Gray
Green
Pink
Purple
Red
White
[/spoiler]
They aren't transparent, but that's easy enough to fix with a masking layer. I'll do those in a bit.
Edit: Done. Not quite as easy as I had thought because the basic palette PNG was a sloppy edit, not one from the press kits, but not too bad.