This is an older one, but it's so bright and fun, it's great for summer.
This manicure used Nabi 3D Rainbow Effects holographic polish. They're not super strong, but they give a nice linear holo effect in bright light (you can just barely see it in this photo). I always wanted to get more of these, but the place locally that sold them stopped carrying them.
The glitter polish is by Hard Candy. It's called Mom & Pop. It has peach, pale green, pale yellow, pale pink, white, and silver holographic glitter.
3 coats Nabi 3D Rainbow Effects in Green
1 coat Hard Candy Mom & Pop
They go with my ukulele really well :D