Find Images in Books
You can find many great pictures inside the books at Rogers Library, particularly the oversize books.
You can use the library's scanner (attached to a computer near the back of the computer area) to make a digital copy of the image, but remember to respect copyright.
Find Icons Online
Find Images Online
If you are using an image for educational purposes, then most of the time you can use any image even those that are copyrighted. More info here.
However, here are some good websites to find images that you can freely use: