sudo apt-get install gtk-3-examples

gtk3-icon-browser

$ find /usr/share/icons/ -name '*emacs.*'
/usr/share/icons/hicolor/16x16/apps/emacs.png
/usr/share/icons/hicolor/48x48/apps/emacs.png
/usr/share/icons/hicolor/scalable/apps/emacs.svg
/usr/share/icons/hicolor/128x128/apps/emacs.png
/usr/share/icons/hicolor/32x32/apps/emacs.png
/usr/share/icons/hicolor/24x24/apps/emacs.png
/usr/share/icons/Mint-X/apps/96/emacs.svg
/usr/share/icons/Mint-X/apps/16/emacs.png
/usr/share/icons/Mint-X/apps/24/emacs.png
/usr/share/icons/Mint-X/apps/48/emacs.png
/usr/share/icons/Mint-X/apps/32/emacs.png
/usr/share/icons/Mint-X/apps/22/emacs.png

hicolor_emacs.png -> /usr/share/icons/hicolor/48x48/apps/emacs.png
Mint-X_emacs.png -> /usr/share/icons/Mint-X/apps/22/emacs.png

for i in ~/foo/*; do dpkg -S $(readlink -f "$i"); done