Where to find wall-ground patterns that join seamlessly

I'm new to the design world, and I recently saw a video made with After Effects where a wall and ground seamlessly joined together with a pattern of green lines, which appeared to be in PNG format. It looked like the wall and ground had the exact same pattern. I'm interested in finding and purchasing similar patterns that can be used for both walls and grounds, as shown in the attached image.

Does this type of pattern have a specific name? I know there are seamless patterns, but do they have the same name when it comes to 3D designs?

My questions are:

1. What do we call such patterns?
2. Where can I purchase them?

Thank you in advance!