Originally posted by jenna_h
Anything that came with your distribution will be in /usr/share/pixmaps or /usr/share/icons (or a subdirectory of those).
Thanks jenna. I found them in /usr/share/icons and there were indeed several subdirectories there. I also found out, at least in my computer, that I couldn't save an icon directly into this directory as a user. I had to save it to my home directory and then copy it to /usr/share/icons as root.