If it helps at all the G1 ponies had a blend of colour and silver glitter - the silver is what really makes it pop.
For Medley I'd go Michigan Moss on the first link and for Sunbeam it'd be Bright Gold.
Yes, I have heard that, thanks
I can't find a fleck of silver on Sunbeam for some reason - I'm sure it all rubbed off.
I'll try the colors you suggested, thank you!