Group Chat Question

Does anyone know how to change the settings in a conference chat so the username is a different color? I have a conference open and two of the users are the same exact color.

There is no setting to change the color. Spark is automatically generating colors for usernames based on a name, but sometimes the color is the same for several usernames. I guess it has a low number of colors to choose from, or the algorithm generating colors is not very random.