Blues can be lighter or darker, so maybe you just have a bunch of different shades of blue?
It will probably be more clear as they grow some feathers, so maybe within a few weeks the answer will be obvious.
If they grow up to have completely white feathers, then recessive white is the...
No, crossing breeds should not change the usual black/blue/splash results.
That is what I would expect as well. I'll wait for the photos before I speculate any further.