Self blue d'uccle x blue showgirl = 25% black silkie het lav, 25% black showgirl het lav, 25% blue silkie het lav, 25% blue showgirl het lav.
Self blue x partridge showgirl = 50% silkie, 50% showgirl, with 100% being het for lav. The color would likely be ranging from dark partridge to black with gold bleeding through.
The birds would be smooth feathered, bearded and with slight crests. They would have feathered legs, dark skin, and should have five toes. They should also have bluish earlobes and a walnut comb (unless the showgirls are het for single comb, then 50% will have single combs. If the showgirls have single combs, all the f1 offspring will have single combs).