I am playing around with this now. Is there any way to add your own custom fonts and images in the cards?
Adding special font requires coding to be added to the style files. Which font did you want added and where? Perhaps I can add it with the next update.
Add your own images is also a coding issue, and a little bit trickier to do. One of the style templates is designed specifically to support adding your own images: it is the style called "Large Image Style." Did you have something else in mind?