Possibly the most vivid species is this cane cholla from northern Arizona is this white wonder. Also very easily grown.
Almost as glistening a white, this creeping Opuntia (sometimes classed as Grusonia) is found primarily between Santa Fe and Albuquerque in New Mexico. It is painful to manhandle, but vigorous once established. Notice the brilliant contrast with the fragilis behind.
And finally Opuntia trichophora in its shaggy wonder...Now can you see why opuntia lovers are as fond of the stems and habit as we the magical flowers! You too could get stuck on them!