You can create photo albums separate from and in addition to project photo folders.  Photos in photo albums can be added to any project.

To create a photo album:

1. Click on your name near the upper-right corner of any page.
   
   
2. Select Manage Photos:
   
   
   
3. Click on the Albums tab.
   
   
4. Click on the photo album icon with the plus (+) symbol:
   
   
   
5. Enter a name for the new album, then click the Save and Continue button:
   
   You are taken to the newly created album.
6. Click the plus (+) symbol, or click the Add Photos button, to add photos to your new photo album: