As it turns out, one of my Cuckoo Marans is consistently laying speckled eggs, too. As well as my Euskal Oiloas. The Marans lays a nice brown egg, with DARK brown speckles. The Euskal Oiloas, lay gray-ish brown (almost taupe) with blue speckles. The eggs in the center and right, are from the Euskal Oiloas, left is a "repaired" cracked egg, from the Cuckoo Marans. I don't know if the lighting is good enough to show the bluish speckling in the Euskal Oiloa eggs.
I just collected three eggs from my black cochin bantam hen which lay light brown eggs, and two of the new eggs are speckled. Im baffled. Shes my only hen though. Apparently shes talented.