You may wish to get rid of some templates in the contextual menu in KDE. The best practice would be removing the package installing those templates, however this is not always possible due to dependency problems. Examples are: 
Illustration Presentation TextDocument SpreadSheet HTMLFile
which are part of Koffice suite but are useless if you only use OpenOffice Suite. These are installed by package koffice-data-kde4 which is a dependency of krita4, thus cannot be removed. All system templates are located in: /usr/share/templates so this command line command would get rid of them, at least until next koffice-data-kde4 package update! 
cd /usr/share/templates
sudo rm Illustration.desktop Presentation.desktop TextDocument.desktop SpreadSheet.desktop HTMLFile.desktop
You have to log out and in again for the changes to be effective.