Bulletproof Symphony is the name of today's polish.
This is a quite interesting polish. From a distance, it looks quite subtle, almmost a little boring. But there's so much going on, as you can see in the macro shot. It has a sheer purple base and is filled with myriads of gunmetal flakies and silver holo sparkles. On the nail, it looks more taupe than purple or grey. The base is too sheer to get the polish completely opaque, but Bulletproof Symphony is so sparkly that the nail line wasn't really visible to the naked eye (other than my camera, who picked it up clearly).
ILNP polishes are available on Etsy, Hypnotic Polish, Harlow & Co. and at their own shop.