There are manycolors to pick from. There are color combinations and then there are also spotted. Go to arba.org for pictures of different varieties (colors).
Are they doing this while mating? my rabbits used to do this when mating, im not sure if its 'normal' u should ask ur vet if u take a rabbits to the vets.
white and sometimes grey. it depends where you are in the world.There are so many different colors and varieties. Go to arba.org for full color pictures of all the different varieties.