As a wise movie called Mean Girls once observed, Halloween is the one night a year when nice girls can wear whatever crazy-sexy/silly getup they want and nobody can say anything about it. The same can be said about nails. For many of us, this is the only time of year we might actually wear one of the clever, highly involved nail ideas we heart on Instagram. Like this adorable Harry Potter-themed manicure by nail artist Stephanie Stone. The challenge is that we usually don't spot an idea like…
