We will look at four themes: Clean,More, Boost - the new theme in M3.2 under development and 'Shoelace' - my freely available theme. We will discuss what is good, bad about the interface and how it can be improved.  For non-technical participants I will be happy to show you quick non-scary ways of writing CSS selectors to tweak your themes in the 'Custom CSS'.  For the developers in the audience there will be time to discuss the benefits of 'Mustache' templates.