Colloquy theme for Mac with smooth appearance and bubble design.
Installing Smooth Operator is simple. Start by unzipping the file and moving it to ~/Library/Application Support/Colloquy/Styles/ (and create the Styles folder if it doesn't exist). Then, open Preferences -> Appearance, select the new Style from the Default Style drop-down menu, and re-select Default in the chat room using the Style drop-down menu in the toolbar.
But what if you don't want to use the new style as a default? No worries. Just select the Style from the Style drop-down menu on an as-needed basis in particular rooms. Overall, Smooth Operator is a great choice for those who appreciate both style and functionality.