I love, love, love holographic nail polish and this is one of my absolute favorites:
Layla- Black Flash
Isn't it gorgeous? Out of all of Layla's holographic polish, this is my favorite. I loved it so much I was willing to pay $15.00 for a bottle of it. That's a lot to me, and my hubby LOL.
This polish comes with a special file, which I did not buy. Granted it was only $2.00, but that would buy another bottle of polish! The bottle also says it is only for natural nails, and that's not true. For either natural or acrylic nails, use a ridge filler base coat. You may have to use two coats to get your nails smooth, but that is all you need to do to get the desired effect. Even a good top coat would work for your base. Enjoy and Happy Polishing!!