This code enables you to set a different fallback featured image for all posts in each category when one has not been set.
Otherwise, the featured image you set will be shown instead.
The code also includes a default fallback image ( default-image.png ) for posts not included in any of the categories you include in the code.
The images are pulled from your child themes images folder.
The code uses the genesis_pre_get_image filter therefore only works in Genesis.
You could also code it this way:
The only problem with the above code is it doesn’t display the same as your Genesis > Theme Settings > Featured Images. Its not aligned according to your settings and isn’t linked back to the single post.
Set Default Image For All Empty Images
This code pulls a image from your child themes images folder and displays it as a featured image on all archive pages when one is not set: