I think I have a thing for the combination of blue and glitter at the moment, at least if you look at what Nailspotting sent me.
Midnight mambo from Sephora by OPI is a bright blue that sparkles very nice in the bottle.
Unfortunately it doesn't sparkle as much on the nail. I had hoped for more. It dries matte and bumby so a top coat is necessary. I used two layers of top coat but I should have used two more I think.
The formula is really good though and I only needed two layers to get full opacity.