Yes! This is currently an option on our desktop website story editor (we're working on a feature for the Inkitt app, so stay tuned).
With our cover editor tool, you can create and edit your own cover picture, having the ability to change the font for both the title and author name. You can edit size, color, and also make text bold or italicized.
We have a large library of royalty-free images for you to use provided by Pixabay, which you can access right from the cover editor, as well as different fonts for your Title and Author Name.
NOTE: The story name and author name pull straight from the title and your "Display Name" in your personal settings.