Rainbow nails! Ignoring indigo, there are six colors and five nails, so there is one nail on each hand that has two colors.
1) clear coat
2) first base color covering the whole nail (e.g. blue)
3) second color covering the other half, and then do a light coat blending into the first color (e.g. purple sparkle on top of the blue base coat)
4) top clear coat
5) optional silver edging (not pictured)