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OK, to develope what I think you are wanting will take several years.
1. Cross a SPLASH rooster of your chosen breed with a Cuckoo Marans hen
Your first generation cross will be sexlinked-males will be BLUE barred, females will be solid blue, if you use a BLUE rooster instead of a splash, only half of your chicks will be blue, the other half will be black.
2. After that, your biddies will not be sexlinked, it only works in the first generation. If you want to continue breeding for blue, keep breeding your hens back to a blue or black rooster, selecting only the darkest eggs from the pullets for hatching. I would keep a rooster or two out of the darkest eggs, AFTER the 2nd generation, if you don't want the barring. If you breed a first generation rooster to your hens, some will be BLUE CUCKOO, which could be very pretty, IF you wanted it.
I hope I helped, instead of confused you!