Sure we don't have those [yet], but look at all the amazing and beautiful mutations we DO have!
I think some people have been looking into colour feeding (like you do with red factor canaries) that can work to make some budgies faintly pink, but the reason there are no budgies with pink body colour is because they only have yellow and blue pigment in their feathers. There are chances these could mutate in the future, and at the rate we're going, who knows how many colours well have in 3013?