Alpine desk — Lake Minnewanka

After importing the board, open it, then Settings → Design → Background → Custom Image.
Choose backgrounds/alpine-lake.jpg from this pack and click Upload.

Photo by James Wheeler on Unsplash
Source: https://unsplash.com/photos/mountain-reflection-in-lake-minnewanka-XuAxyq0uRT0
License: https://unsplash.com/license

The photograph is uploaded unchanged; ReadyTab uses its normal centered cover crop.
Backgrounds are stored separately and are not included in board JSON import/export.