This spring, there is only one theme to keep in mind when it comes to nail polish: color. The latest nail brand to stick to this theme is Butter London, which has just unveiled a five-color lineup that mixes soft pastels with popping neon hues. The line includes: Bossy Boots, a pale pistachio green; Disco Biscuit, a tropical hot pink; Knacked, a glittering oyster; Slapper, a bold teal; and Trout Pout, a retro cantaloupe pink. Our verdict? These colors may be bold, but it is safe to say that there is something for every occasion, thanks to the low-key Bossy Boots and girly Trout Pout. The full Butter London spring 2012 collection is available now at ButterLondon.com. Each color retails for $14.