Nail of the Day: OPI Last Friday Night. This polish is from the 2010 Katy Perry collection. This polish has a very sheer light blue base with beautiful holographic glitter. It took 4 coats to achieve medium opacity. I really like the subtle hint of color and glitter on the nails, much like Teenage Dream. If my nails were longer, the visible nail line might bother me, but because my nails are short, it doesn’t really matter.