I think the theme of this collage is love, desire and passion. There are many images of couples and red hearts in this collage. The relationship between a man and a woman is definitely a representation of love. However, love also exists between parents and their children. The pictures of a person holding a baby and a graduate student hugging someone can be seen as another type of love. Also, the image of diamond obviously represents eternal love. The picutures of lips and cosmetics may represent desire. I think that women dressed up in order to attract men and the image of the lipsticks and the mascara can be seen as the desire for men. I am not sure about the images of pizza and the avocado but I think they may symbolize the passion for food.
The hearts are the most obvious images that reflect the theme. There is no doubt that they represent love. However, some of the images do not quite fit to the theme. I do not understand the meaning of the plane in this collage. I am not saying it is wrong but this may show that we have different views on the theme.
It is interesting that we choose these images randomly from the publications that represents the same theme. Some of the pictures are similar and some are quite different. We use both our imaginations and common sense to put together the pictures.