Many other puja components that are considered auspicious (sattvik) as per Vedas are used to worship deities and to perform various Vedic rituals. Hinduism is referred as Dharma (a way of living) which guides the followers just not to achieve external happiness but internal blissfulness to live and experience life in the fullest possible way.
Decorations are part of Indian weddings. With time the Indian wedding decorations have changed. In most Indian weddings you would find floral decoration in marriage hall or venue. So, you will find some more than just the standard decorations in an Indian wedding.
Indian Weddings are incomplete without rituals and Jaimala is the most important ceremony in Indian weddings where the bride and groom exchange flower garlands. So every ritual is incomplete without flowers.