For these nails, I used OPI The Show Must Go On and OPI Stay The Night. Stay The Night is a black based polish with bits of bright fuchsia glitter that dries to a rough, sandy finish. The fuchsia peeks out like embers under molten lava, it is a really unique look. Here is two coats of Stay The Night alone.
For the designs, I used both a dotting tool as well as blue painters tape. For the index finger, I used the dotting tool to make dots of decreasing size with the Liquid Sand. For the middle finger, I used small strips of tape and painted over Show Must Go On with one coat of Stay The Night. On the ring finger, I used the dotting tool to make hearts with The Show Must Go. I used a similar technique on the pinky finger with Stay The Night and outlined the heart in small dots.
While I'm not sure the Liquid Sand polishes would stamp well (I didn't try it but I would guess no), there are a lot of other nail art techniques they work well with. I didn't put a topcoat over any of the sand polish here, but that would also be possible to give it a bit different look. Lots of fun possibilities! Of course, lets not forget the beautiful duochrome of the base color here...