The hottest nail colors for spring 2015 are here. Out is the old, in is the new. The hottest trends in nail colors for the spring season 2015. The new seasons come with new nail polish colors that dominate the runways, fashion trends, and all the celebs. The hottest colors in season are mustard yellow, any shade of blue is trending, lilac, pale orange, and boysenberry. These hottest colors are dominating the season. Let’s take a look at some spring nail fashions for 2015.