Summer is too hot, we need some colors to cooldown. Blue color is on the top list for that. Therefore, blue coffin nails has been the trendy nails design for many girls in Summer, fashionable and cool. We have found some stylish blue coffin acrylic nails on Instagram. There are lots of different nail shapes available but we chose coffin nails today because they are easy to wear, you can have long nails without the sharp points and it is one of the most popular shapes too.