Day 9 challenge is Rainbow. Skittles come to my mind.
Please ignore the fact that I added blue to the dots (skittles don't have blue in the original package :-p)
For this, I used my French Tip Dip to make white tips, then a dotting tool to make rainbow dots over the white tips. I also did an accent nail that I just played around with.
The polishes I used:
Tips and accent nail before I added dots (skittles)
The finished product in several lights