Well not exactly highlighter, more like inner corner shimmer that stands alone nicely. I've been told so far that Nylon is too frosty........so.........anything will help.
I use either vanilla or pink opal pigment depending on the colour e/s I am wearing. Both are amazing. They are more iridescent than frosty. Everyone should own vanilla pigment, I don't know how I lived without it.
I use vellum a lot, but it's white in the pot with a blue/violet/green shimmer depending on which liner/shadow you use additionally on your skin. on its own it looks pinkish/violet. If you want a white shade: White Frost will work