I was thinking pastel because of the yellow color on the others and the faded head on this one but now that I think about it, I forgot Vanillas have a faded head too. I figured maybe the color got washed out and the pattern was a bit odd either from the Vanilla gene or maybe it was just a weird patterned pastel that hadn't colored up yet for whatever reason. I didn't cut the egg until after they pipped themselves but I'm not sure if they can still take time to get their colors even after they hatch.