Use a bobby pin to make polka dots on your nails. You have to bend the bobby pin apart in order for it to work but after that it's the best thing ever for making polka dots! I did it for my birthday last year!
Do ombre French Pour a dime-sized amount of two colours onto a piece of plastic wrap. Use a toothpick to blend the two colours together in the middle. Dip a sponge onto the polish and place on the nail, wiggling back and forth a little. Let dry.