A decorated wedding car is sort of arrangement for the whole ceremony. Some weddings have a special theme or a special mixture of colors in their designs that sometimes go all the way to the groom and the wedding dress for example if a light purple or cream color was chosen as the theme color (curtains, table, flowers, invitations, etc..) You can join with your car with a theme and decorate it with color matching.
From side to side you can add on a door handle. With the addition of flowers and purple ribbons wedding car then you will look more luxurious.