I knew right off the bat that I wanted to use a song from Spongebob Squarepants for today's prompt. Some people think I'm too old for Spongebob and I don't care. Anyway, I went back and forth between a few song choices and I settled on the FUN song from the very first season. Fun fact: my alarm clock in high school was a Spongebob one that played that song.
On to the nail art!
The gradient base is Studio M Total Wow at the cuticle and Blue Funk at the tips. I used SO MANY colors for the rest including many that I custom mixed.