Hi,
I've worked on these birds a while now, I remember 18 months ago, a few of my normals (Browns) were getting the odd white feather on their breasts so I started to breeds these birds together.
Over time and a few generations by only selecting birds with more white feathers there came a time when the chicks were full white breasted and looked simular to tuxedo's with out the white faces. Very pretty birds. For want of a better name, I called them white breasted normals as they came in normal, Cinnamon and fawns.(Wild feather pattern)
There was only one problem I found with them, and that was they are difficult to sex by looking at them. I had to wait until they laid eggs or crowed, even vent sexing was done.
With the birds now you are producing, white feather randomly placed on their backs and wings, At sales I've seen them with rather more white upto 40 white feathers around the body. I may get some next time to work on them for a while and see what I can come up with. By the way, someone has termed this variety Mottled, same way Niki calls them Spangles.
I suggest with the single bird you have is to pair it back with the parent in hope the further chicks with white feathers are produced and just work on them. You could come up with just about anything, even a "dalmation type?"
Ironsun.