The flowers are generally blue and white, although once pollinated, the white portion (called a banner) turns magenta (see the lower whorl of flowers below).
This is an interesting "trick." By keeping the petals intact even after fertilization, the plant maintains a large inflorescence which helps to attract pollinators (e.g., bees) from a distance. But when the pollinator is close, the two colors send different signals to the pollinator = a magenta banner basically means "don't bother" while a white banner means "this way!"
This appears to be a very good year for Miniature Lupine (you might say it's having a banner year!). As you could probably tell from the post on 7 April, I became intrigued by the patterns created by the petals when viewed from above. Here are two more examples.