It’s beautiful and inspiring.
Allow people to upload photos of their (and others’) balcony gardens. Arrange in multiple ways, by color, geography, season, etc.
We meet family, friends, colleagues etc. at special evens like birthdays, parties, and other celebrations. Everybody takes photos especially nowadays when everyone has a camera in their phones. It would be good to have a place where all of the photos (maybe also videos) could be gathered and an album created for all to enjoy.
Enable the organizer to select a design, upload his photos and videos, and invite others to do the same (with a deadline). When everyone finished uploading or the deadline is up, the organizer makes the final decisions on what will be included and where. Then the system sends a link to the final version to all participants. They can decide who to share it with (if it’s allowed by the organizer and the participants). Hard copies can also be ordered.