As one of the nails I had to do for a 30 day challenge I had to do "Neutral with a Twist nails." So I took OPI Samoan Sand as the base and Julep Mila as the glitter gradient.
All you need for this mani is a glitter polish, a plastic bag, and a makeup sponge. First, you put some glitter on a plastic bag. Then you press the sponge down on the glitter to get it on the sponge. After that you sponge the glitter on the tip of your nail. A lot at first, and then as you move up sponge less and less. You'll need to reapply the glitter to the sponge a few times in this process
That's it! I'll post some picture tutorials soon.