I'm coding a Forms package.
Forms will have content composed of specified items such as text boxes, lists, images, etc.
At present I'm just designing it as Galleries full of Forms. All documents inside each gallery use the same form definition, as the format definition is in the content of the gallery definition.

A simple way of thinking of it is as being able to define galleries of various format. Instead of images with captions, you might have images with captions and checkboxes. Or no images, instead descriptions of restaurants and lists of menu items.

And Forms will be using a Liberty format plugin, and they will simply be another Content type. They should be able to be manipulated as any other page.