Image Repo and Uploader for specific role
You could use taxonomy easily enough.


Create a vocabulary called Node Images
Add an image field to the taxonomy term
Add all your terms (just name and the image)
Under manage display (for the term), set it up to only show the
image field
Under manage display -> full content (for the node), add the
taxonomy reference field and set the format to Rendered taxonomy term &lt;- (requires display suite)


On the content type that your staff uses, add a taxonomy reference field with a dropdown or autocomplete.  When they create new content, they would be able to select the correct term/image to attach to the node.  You would just need to initially add all the terms/images to the vocabulary.