Mottle or Spangled is a fun colour half way between the Jubilee & Laced in my opinion, sadly in the Orpington it is not so distinct
as in other breeds due to feather growth, but it works in its own way if mainly in the dark base colours. I had a lovely black mottle
hen from imported stock, she was crossed with a blue, then a chocolate to get my foundation stock. I have since hatched several split & fully mottled
hens & growers in Blue, Black & Chocolate & Mauve. As a note the full mottle is only apparent if both parents have the mottle gene, here are some light blues, some darker blue chicks plus a black cockerel grower, a Mauve mottled pullet, a chocolate mottled lad with a younger brother (split for choc) & the blue mottled cockeral.