Black is a good solid background for nail art designs like the one you see in the image. The dark base color seems to make the multi-color nail art design light up like stained glass windows. The pattern is easy to create with fun colored nail polishes. You can even use water color to achieve the translucent effect.
For this look, it is crucial to use a topcoat with a matte finish so you can fully appreciate the effect. You can, of course, use a topcoat with a glossy finish but it could detract from the overall statement that you want to make with this design.
Image Source: adifferentshade.tumblr.com