It's a pricey set of nail stickers, but shipped to you will be 80 little nail stickers, so maybe worth it. Also comes with 3D glasses. Neato.
(not available anymore) Was once available here, $24.95
Since those are gone, try these maybe:
Hacks to making your own nail art
Nail wraps, from tacky Christmas sweater designs to holographics here
And these, which cost around $15 each, from Peanuts to Avengers to cherry blossoms