Upon the merger of Alaska and Virgin Airlines in 2016, a special merger livery was applied to select aircraft. Featuring a five color gradient paint scheme, it still is striking years later. The paint was tinted with mica adding a sparkle effect to the livery. (Not currently featured due to paint kit limitations.) The livery is painted on a Boeing 737-900ER as well as a few A321's. This rendition features the current look on the -900ER which removes the Virgin text and adds a Oneworld sticker next to the door. There may be future options to re-add this missing text in the future.
You can find my fictional -800 version here if you don't own the 900: https://flightsim.to/file/41340/alaska-airlines-pmdg-boeing-737-800-more-to-love