It seems to me that
- I can access free clipart and other graphics, there are a plethora
- I would like to provide customers with a styled library and offer to modify those files as a service
- SVG files are easy to adapt
- .svg files can contain animation
- There are plugins and there are safety measures such as only allowing admins to load .svg
- There is a useful plugin
Open Clipart
Open .svg repository with an active remix community, is it getting old, like me?
Public Domain Clip Art
https://www.pdclipart.org/
Public domain free and no registration required
Wikimedia
https://commons.wikimedia.org/wiki/Commons:Free_media_resources/Photography
a lot of stuff here
Rawpixel
https://www.rawpixel.com/category/53/public-domain?filter=ornament&page=1&sort=trending
https://www.rawpixel.com/pricing-and-plans it’s free for up to 5 images a day
among the flotsam and jetsam are bits of DMOZ
https://dmoz-odp.org/Computers/Graphics/Web/Free/