Oceane Body Design has a variety of Nails: Mesh, appliers and even simple gloves and layers. Most of can be bought in the Main store.
The Nail polish (on gloves and layers) is available in lots of colors.
You can read more about the Mesh nails here, but the big difference with the gloves is of course that they are long, like real nails and that you can wear them without an alpha layer. They adjust to the size of your hands with a typed command in chat, so not fitting issues.
Nail appliers for Mesh Hands & Feet
Mesh appliers for SLINK hands are available for hand AND feet. Buy the feet and hands first at SLINK. The nail appliers work separately from the hand and feet skin appliers.