I'd love seeing some parts for various type of race vehicles, preferably multiple segments to enable greater creativity amongst players when constructing rally, formula, drag, or stock cars. The player agency flag can act as the sponsor, and decals could vary depending on the part.
Racetrack parts could also be nice, and could possibly be created similarly to colonies in the future. A unique way of spawning players that doesn't involve runways or launchpads, but rather something more like a garage or pit area could also be useful.