Black mascara is universally great for any eye color. If you have fair skin and light brown hair, brown mascara is a great choice for a no-makeup look. Blue mascara will enhance light brown eyes, if you have a darker skin tone, apply some black eyeliner on your upper lash line or fill in the lash line with a pencil liner to make your blue mascara pop. Purple mascara looks great on hazel eyes as well. Lastly, green mascara will enhance your brown eyes like no other.