I don't think that sharing things and requiring attribution is enough. I think that public domain is the real definition of free, so whenever I search and do not find a public domain thing that matches my needs, I make one. You may have them all. They are free. If you want to do the same I would appreciate it, because creating art is difficult. Finally, If you want me to make icons regularly, you can patronize me here: https://www.patreon.com/theTrueMikeBrown