It is critical to make sure you have permission to use the images, documents, and objects in your exhibit. Even when you are using them for educational purposes, publishing images to the web for which you do not have permission does not constitute "fair dealing."
For an overview of databases for "public domain" images please see the University of British Columbia's list of Image Sources. Below are a selection of collections and gateways to items and resources either in the "public domain" or are available for use:
If using in copyrighted material and which does not fall under "fair dealing" then please consult UVic Libraries Copyright Office.