In celebration of Cinco de Mayo (OK, I was just feeling indulgent), I splurged on this little jewel of soft earthy pastels ($40; bobbibrowncosmetics.com). The ten shimmery shades can be layered in countless ways—stick with a muted neutral mix for day, or sweep bold teal or tangerine across the lids to amp up the drama at night. No matter which way you go, it’s virtually impossible to wind up looking like a fool (and that's no easy feat for me). —Jennifer Riley