Serendipity user m2.ag asked this question on the Serendipity forum:
Is there a chance to use an individual header image for each category (a category title/als ein kapitel-titel)?
This means for example:
Category "News" shows a foto of a newspaper as header
Category "About" shows a foto of a book as header
Category "Contact" shows a foto of a pen as header
etc.
Serendipity core developer Garvin Hicking supplied the following answer:
You can use the bulletproof template for that, it offers selection of a header image.
Then you install the "Properties/Templates" plugin. Now for each of your categories, you choose the bulletproof template. Then you can configure the theme options for those categories independently!
So you still only use one template directory, but template options are distinct for each category.
You need s9y 1.2 or newer for this feature.
So, now, using bulletproof as your template, you can easily change your header image for each category - or any other item in the template configuration - by following Garvin's instructions.