You can still achieve it, with interface textures:
Note: If you are using this texture files. You are forced to use the texture, you cant disable it via any AddOn.
Inside this folder are the different texture files, the one you want to use you need to place in the main Tooltip folder.
Code: Select all
World of Warcraft \ _retail_ \ Interface\ Tooltips ChatBubble.blp ChatBubbleVertical.blp