What kind of flowers do bees eat?

Daisys, tulips, marigolds. Mostly its the bright colored flowers such as those I do believe. Bees cannot see red, but see ultraviolet wavelengths so colors in the blue and violet spectrum are attractive (ie - rosemary). If a flower is a good producer of nectar or pollen, bees will be attracted to it regardless of color. See the links below for some examples.
Sunflowers