I have two swatches of this, alone above and over a dark-blue polish below.
It's basically sort of a cornflower blue matte glitter, with big hexes and some smaller pieces. You can see above that I also bought a dark-blue version (which is called TNT) - but I think I like this one better. I especially like it over the dark blue, out of the various things I've tried.
I think this set was called Transformers Top Coats. I bought mine on sale a year or so ago, so I'm pretty certain they're discontinued.