Shades of Blue
Hop on this season's affinity for monochromatic looks and pick out two colors in the same color family for your toes and fingers, suggests manicurist Rica Romain. "My favorite color is blue, so rule of thumb is if you don't use the exact same color for your hands and toes—use a lighter hue or shade on your hands and darker on your toes."
Look to the color wheel for your mani and pedi combo. Colors that are directly across from each other are the most complimentary, explains Romain. We like a purple and yellow moment, like JinSoon Nail Lacquer in Soubrette ($18; nordstrom.com) and Yves Saint Laurent Beauty La Laque Couture in 62 ($28; barneys.com).
Subtle and Sexy
Unicorn makeup might be trending, but for your nails, look to the sea for inspiration. Liang says that an "almost mermaid, water-inspired color combo" is a fun summer look. Try Ten Over Ten Nail Polish in Rivington ($18; net-a-porter.com) and Sally Hansen Nail Polish in Black and Blue ($7; target.com).