What colours do you want to see?
Game director Jeff Kaplan took to the official forums last night, and announced that Blizzard is working on new reticle options for an upcoming patch.
Jeff Kaplan explicitly stated that a color-picker won’t make it into Overwatch as it’s simply out of Blizzard’s scope for what they can bring to the game.
In the meantime, players are encouraged to have their say on what colour reticle they want to see in Overwatch by giving a relevant RGB value in the forum page.
More details on additional reticle options will be provided as Blizzard prepares its next PTR.