Executives told Business Insider they were surprised by how many shoppers wanted to add color to their cars. Ben Shimkus/Business Insider New cars are increasingly gray, white, black, and silver. Slate, the no-frills $25k EV pickup, launched a collab with Crayola to brighten up American roads. The partnership comes as Slate races toward its first deliveries. American cars are going gray. A Jeff Bezos-backed startup thinks it has a colorful solution. Last year, 80.4% of new cars were either whi