Into The Meadows
Silverudd
One of my main breeding pens & "tools" that I use to make hybrid birds are Silverudd. They lay a light green egg with many being speckled and heavily bloomed. The same hen that lays a plain egg one day, often throws speckles the next day. It is important to note that NOT all eggs are speckled, but that does not mean offspring won't produce eggs with speckles. Our rooster came from a heavily speckled egg & passes that on to offspring. I use a blue rooster over blue, black and splash hens and strive for the heavy splash plumage in my flock.
Meadows Blue
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It is important to note that this is NOT a hatchery breed and rather a project to work towards speckled blue eggs. I have made up the pen of Cream Legbar, White Legbar and ICB hens, under a homozygous ICB rooster and a Lavender Ameraucana/ ICB mix to get to the brightest blues. The birds show significant Silverudd traits with varying plumage. Your eggs may be blue with the offspring laying speckled or they may include speckled eggs- it is dependent on the generation.
Marans
Marans are yet another pen & useful tool to gain rainbow colors. I use a "Purple Crosshatch" rooster over my flock of hens that are blue, black & splash. Some are matte, some are heavy bloomed and some are speckled. While I don't chase SOP, I am mindful in my selection of birds that I choose to breed. Marans lay large eggs and are much larger birds than Silverudd. Be considerate of that when building your flock and breeding pens.
Frizzles
My Frizzle hens have been moved under a homozygous ICB in hopes of creating beautiful blue speckled eggs from my Frizzles in Fall. The hens themselves were made mixing Fibro with Silverudd. They will hatch in various plumage colors with the Frizzle gene being 50/50.