Updated: I removed the ones with kids in them, because while I did make sure that the owners of the photos (parents of the kids) had released the photos with a "remix/reuse" license, and therefore were consenting to their use, I didn't think about the fact that the actual kids had not consented. Please delete those icons from your collection if you've taken them. I'll work on making something similar with my own hands and a toy train. Thanks, Fragano.
I made a few icons. Most are for use in discussions when you see that someone is attempting to derail; one has the name of the community. No attribution is needed.