I took two different pictures of Thea (with Sally Girl matte top-copat) and I'm not really happy with either one, but at least you can get the general idea. Mixed holo glitter in a purple base.
Bear in mind that this is what it looks like matte.
Added: After a day or two, I decided to experiment - I put a coat of Zoya Haven, which is a really similar color, on top of this. And it worked well, really - it was just sheer enough that some of the glitter peeked through. It looked cool.