Add custom content to custom layout Panels Is it possible to add custom content to a custom Panels layout?

Specifically, I've created a layout with a couple of columns for a content type called 'Stuff' and I always want to add the same images in a certain column of the teaser (that means every node of the 'Stuff' content type has to contain these images). I created several custom content panes with these pictures, but I don't know how I can use them in the custom Panel layout or the content type.

Any ideas? Or is there a better way to achieve my goal?
You could place the images in a mini panel. Changes to the images would be done in the mini panel and would affect all nodes.

In Panels you can activate the Node view variant and create a panel (with a selection rule for the content type: Stuff). then use your Panel layout and place the mini panel in the column you want the images.

All nodes of the type stuff, should now use your layout with a mini panel holding your images. You can easily change the content of the mini panel and reuse it on other parts of your site.

Hope I understood your problem correct.