ConversationPics is a tweak available since last night in Cydia for iDevices running the operating system iOS 8, and with its help we can display the pictures of our contacts in conversations. Without having any settings menu in the Configurations, Settings application, ConversationPics implements its functionality right from the moment of installation, as you can see in the attached image, and to disable it you have to uninstall it through Cydia.
Add your contact images to all of your conversations! No options to configure.
ConversationPics is available for free download from Cydia's BigBoss repo.
