"Think acid yellow, traffic-cone orange or neon green for the really brave. Color ombres can be really fun as well. You can either opt for a straight-up rainbow ombre or try something more ...

Can't commit to a color? Rainbow Skittle nail looks ... This one is pretty abstract, but it doesn't matter because the bold neon colors make it look positively picture-perfect.

Spring and summer bloom with a vibrant array of indulgent color: a fanfare of fuchsia, sunshine-yellow, neon-orange and bright ... Make Up For Ever both have rainbow-like selections of colorful ...