This would be an improvement to either "Space Attachments" or "Attachments" macro.

you can configure "Attachments" macro to display attachments by label but only from pages you list - not from the whole space or from all of confluence. So this does not allow enough flexibility for grout. For example, if I wanted to on "customers" main page display all attachments labeled "Contract" I would have to specify all individual customer subpages in the macro settings. If new customer if added later I need to go edit the macro to now also display results from the new customer sub page. If I could specify either parent page, space, or all of confluence I would not have to go back and edit the macro settings.

In "space attachments" macro you can specify what space you want to display attachments from but you can by default filter them down to a specific label. You can only show ALL attachments and the user must figure out what the label is we are trying to display files for by either sorting the list or filtering themselves.

So neither solution allows for displaying all files by label for all pages and subpages by specifying parent page, space or all of confluence.

We are on Confluence 5.4 at the moment.