Haldi decorations generally take after the colour yellow to complement the ritual of putting haldi/turmeric on the bride or groom. As most people wear the same colour, the decorations also often go along the same route to match the aesthetic.
CherishX has various haldi decorations that can be booked at your home for the function. It is best to have professionals do the decorating so you can focus on the rituals and the guests in the event.