Down The Rabbit Hole Environment Similar needed

Hello everyone.
Good morning
I am building Rehabilitation Treatments by Virtual Reality games (mainly for Oculus Quest) and according to what the medical specialists on the subject advised me, I have to use an environment similar to Down The Rabbit Hole, so Does anyone know where could I get any similar to it?
My challenge is finding a balance between both themes( Nice visually and that the patient do not distract with the Environment around him/her.
Thanks for your time