Image resource library for use in Sites and Hub

[JenniferBorlick]

When you first create a site/hub, there are a few default images that pop up on that home page. It would be nice to have a selection of "generic" images in a directory that we can link to as url sources.

For example the default image for the home page links to the city skyline asset through this URL. I would like to know what images are in there for our use, and it would also be nice to have a curated selection of images that we could use similar to the icon library.

I am currently trying to create a training hub on our Portal and it would be nice to add images like these to our training gallery.