Using distinct icon metaphors to support both create and add actions

For common functions, icon metaphors are well known and used quite consistently across OSes. Example, cloud icon with down arrow to indicate that data is being downloaded from a server/cloud/online storage.

In this regard, The "+" icon metaphor has been used interchangeably for both create and add actions but when both actions are needed in a user interface, how can these actions be distinguished with distinct graphical/ icon metaphors?

Here I am considering:

• Add action is including an existing object from the system

• Create action is adding a new object to the system

As this is not a new problem and common problem, what add + create icon metaphor combinations have been successful based on products you have created/tested or used?