"Falling flowers" patch advice needed

Hey,

I'd like to develop a "falling flowers" patch. The silhouette of the users should act as object onto which "flowers" would fall and bounce off of, like in the attached image. Essentially, the users would be able to control the flow of the "flowers" on the screen with their movement. I was wondering if there are any examples of similar patches out there and/or if you could provide an advice on how to get started.

Thanks in advance, ZB