These are the settings I use and the banners I use for the Obsidian Banners plugin. I do not take claim to ANY images here. I did not make any of them.
To install the Obsidian Banners plugin you will want to first install Obsidian BRAT as the version that works with desktop and mobile is not the one in the Obsidian Plugin store. It is version 2.0.5 beta.
Then inside of BRAT, you will paste the link for the Obsidian Banners plugin. That will install the latest beta version.
These are all of my settings. It is easiest to upload pictures rather than explain them all. You will want to change the folder to your banners folder. The images I provide in my banners folder above, still keep my vault under 1GB. It is at 730MB and that may be because I also backup to GitHub and have the .git directory. Either way, you may want to trim down the number of images to your favorites.
You will want to click on the code button above and download the .zip as shown in the image below.
Then you will need to unzip the folder and move the banners folder into your Obsidian Vault. Then make sure the banners plugin can find these images. Then you can see them all in the pop up.