At this time the only way to customize flyer layouts is by adding custom Header and Footer HTML.
To add custom header or footer HTML to your flyer, do the following:
Log in to control panel.
Click on My Listings.
Click on Featured Listing Settings.
Scroll to the section for Listing Flyer Settings.
Enter the custom header HTML or footer HTML.
Anything added here will be added to all listing flyers in the header. Remember to keep it simple, as flyers are meant to be printed.