Ich habe die Notification Icons vom notifications@cinnamon.org Applet verändert, so das diese wie in Windows 10 aussehen. Die Icons kann man sich hier herunter laden.
tux@earth:~$ [ ! -d ~/tmp ] && mkdir ~/tmp
tux@earth:~$ cd ~/tmp/
tux@earth:~/tmp$ wget http://wiki.tuxnet24.de/download/attachments/11829275/notification-icons.zip
tux@earth:~/tmp$ unzip notification-icons.zip
tux@earth:~/tmp$ sudo mkdir -p /usr/share/cinnamon/applets/notifications@cinnamon.org/icons/old
tux@earth:~/tmp$ sudo mv /usr/share/cinnamon/applets/notifications@cinnamon.org/icons/*.svg /usr/share/cinnamon/applets/notifications@cinnamon.org/icons/old/
tux@earth:~/tmp$ sudo cp -R ~/tmp/notification-icons/*.svg /usr/share/cinnamon/applets/notifications@cinnamon.org/icons/