It's always wonderful to find more research that validates an idea you have. Judy Robinson, a psychologist friend sent me the link to Project Soothe, which is running at The University of Edinburgh.
Our aim is to use gentle images of nature as anxiety reducing breaks to create a sense of calm. Project Soothe are interested in similar outcomes, they explain the principles so eloquently here.
Like them we want to co-create with the end-user, but see more benefit in mini-films with sound and seek to eventually create a gamified version for children and teens. Please contact me if you would like to help or be involved in trials.