Aspects of the disclosure provide techniques that enable a communication server hosting a virtual communication session to receive theme parameters from a remote server to control the look and feel of the virtual communication session. In one example, a method includes sending a plurality of video feeds for display at a plurality of graphical user interfaces (GUIs) of client devices coupled to a communication session. The communication session enables communication among a plurality of users of the client devices. The method also includes receiving a set of parameters of a theme to modify one or more visual properties of the GUIs. The method also includes sending the set of parameters to the client devices connected to the communication session to modify visual properties of the GUIs displaying the plurality of video feeds at the plurality of client devices based on the parameters of the theme.