How about sending a text message or calling right from the home screen of your HTC One M8 at the cost of one simple tap on the contact shortcut? To add Contact Shortcut on HTC One M8 Home Screen do as follows:
1. Go to Home screen and tap&hold your finger on an empty spot
2. On the opened menu, select "Add apps and widgets"
3. Now tap the title and change it to "Shortcut" (The title should be "Widgets" by default)
4. There are 3 available options for quick access to a contact from the home screen, which are: Direct Call, Direct Message, and Person
5. Select either of these 3 shortcuts, and then assign a contact to it