My idea is to add more customisation so that you can customise your vehicle colour in the vehicle bay with one compound and can change at any point and patterns or unique designs are two compound and must be researched. I think this would be a cool little feature which would make the game more colourful and make your vehicle more unique too.
Also, not only would you be able to customise the colour of your car but the colour of your astronaut too. You would be able to change the colour of the details (stripes)