Generate an intricate collage symbolizing the concept of marriage. Include multiple vignettes in the collage. First, depict a bride and groom of Caucasian descent standing under a floral archway. Both are radiant with joy. The groom is holding a bedazzled golden ring. Second, create a scene of a wedding cake beautifully adorned with edible roses and lovebirds at the top. Third, portray a couple of South Asian descent in their traditional wedding attire – the bride is wearing a red saree and the groom is dressed in a sherwani. Finally, sketch several guests from various descents wearing formal attire, clapping and cheering for the newlyweds.