Here's a cool one from indie brand Enchanted Polish. It's a polish made up of multiple sizes of matte black and white glitter, with some holographic microshimmer in between to fill in the gaps. You can wear it alone as a topcoat:
Enchanted Polish Seven Nation Army, one coat
...but it looks even more amazing worn solo (three coats):
(Looks like granite, right? I think so at least. I think it's awesome. And bonus points cause Jack White. Mmm hmm.)
The formula on it is good. I didn't have any noticeable texture or application issues. One thing to be aware of is that it is a sparse glitter polish, likely intended to be worn as a topcoat. The coverage isn't so heavy that the base polish won't show through. That's a good thing. However, if you want to wear it by itself (and you will, cause look at that!), it's a three coat minimum (I'm wearing three coats here). It's not particularly rough or gritty when it dries, but you'll still want to use topcoat for shine.
This has been sold out for ages, but I'm hoping it'll be back in stock at some point. You can see it here on Enchanted Polish's website: Seven Nation Army.
(sample provided for review.)