I have a minimalistic approach to it - Just my logo, and since this is not my work, it would have an Enderal watermark over it (creators of both the book and logo willing). Much like
this, just with a bit extra added on.
I've always wanted to do a scenic narration over a great cliff or something, though - And Enderal has some great places for that. If I got into narrating many of the books, I might look into doing a different scenic shot every new book.