Yes, there are. Kindly, follow the way to get free assets for making VR apps.
- Go to the dashboard page.
- Select the Resources panel at the upper right in the header.
- Click 'Get 45,000+ FREE Public VR Assets'.
- Get the window with 4 options like the picture below.
- Choose one of them, 360 images, 360 videos, Stereo cube's map, and things like that.