You may have seen a friend rock blue nails on Instagram, or maybe you’ve been wanting to try it out yourself. Blue is a great choice for winter nails. If this sounds like your favorite color, or even if you don’t but still like it, then this post is for you! Nail polish is one of the most popular beauty trends in recent years. It’s not uncommon to see someone with a different color on each finger, or all their nails painted blue. Why are people so obsessed with this trend?  Perhaps it has something to do with the calming…