Back to your original question, that looks like a normal sky blue bird and a blue recessive pied with violet factor.
Violet factor is semi-dominant which means a single violet gene produces some color change and a second gene produces even more, similar to dark factor and grey factor. However, it is hard to see this change on a green bird or on a dark blue (mauve) budgie. Violet factor is most visible on cobalt and sky blue parakeets.
I am not terribly good at color identification, so I don't know if your pied bird has one or two violet factors. I think it is either sky blue with double violet factors or cobalt with one or two violet factors. Someone else might be able to advise you better.
Regardless, a pairing between these two birds would likely result in a mix of blue colored budgies - some sky blue and some darker, due to either dark factor or violet factor.
The pied markings look like recessive pied to me, so you would probably end up with normal looking birds that carry pied genes (split to pied). However, the normal sky blue bird could be split to pied already, in which case you might have some pied offspring.
It is also possible for a bird to have more than one kind of pied gene - unless you know what the parents and grandparents looked like, it can be hard to rule out anything completely.
Be sure to keep good records. This can help you identify the full genetic potential of your breeding pairs.