Not mutts. First of all, they are all silkies of one sort or another, so they are not mutts.
Depending on the particular colour crosses they may well come out in recognised varieties; or they may not. The bowtied roo will not pass the naked neck gene to half it's offspring, so those will be silkies, pure for the not-naked-neck gene.
I'm going to predict a likelihood of partridge and blue partridge (from the splash) offspring based upon e^b and the likelihood of Pg, but it is by no means certain. Other colours or patterns could certainly show up. It all depends on what the white hides.
With the addition of a white hen, there will be white offspring.