Looking at everyone having their own taste in what needs to be rendered on such a card and how - rightly so, I have started adding the ability to create Templates and Themes for the cards.
A theme can hold any variables/configuration, but by default will simply re-use the settings from the Appearance tab. A template can then use that Theme to generate fields. A template will contain a predefined set of methods that can be called to generate the image like Title, Subtitle, Logo, Author and a couple more based on the needs of the default template. Each of these methods in a template can then be used to generate a layer into the image.
I'm also trying to allow these templates to use the natively shipped FA icons so that's going to allow these images to look even more awesome.