Skull & Glossbones might be my favourite from OPIs Pirates of the Caribbean collection. It has a sophisticated look, although the comparison that comes up in my head is bones. Skelletonsbones. It has a light, dirty grey tone with a hint of green that reminds me of bones. I like it and I think it looks good.
Like many pastells the first layers are streaky but after four layers it looks great. Sometimes a polish is worth four layers, and this is one. It is easy to paint it as well.
A color too keep. And use!