It's probably not cheap toys as much as the rise of synthetic dyes generally meant color was no longer a mark of cost. The denim community still likes indigo be

It's probably not cheap toys as much as the rise of synthetic dyes generally meant color was no longer a mark of cost. The denim community still likes indigo because it fades, but that could just be signifier that it's authentic. It could also just be that color attracts attention. With birds, it's often the male that's more colorful. See peafowl.