I like favicons a lot. For my sites, I even created the favicons myself However, for those who don’t have the software, the time or the ability to do it, below is a long list of favicons. Because it includes literally thousands of icons, I split the list into sub-pages making it easier to navigate. Hopefully, you can find one that fits what you need. If you see some icon that you like, you can just right click on the icon image and save it to your desktop.
Don’t know how to add favicon to your site, my old post Create Favicon For Your Website may help.