Hi Billie,
One of the members here (Screen name: Thamnophis) made the best collection of garter snake pictures that I've ever seen on his website. While it's written in Dutch (without English common names), you can get around by clicking on the scientific name. Then click on the "Foto's" box below the scientific name. It'll give you an idea of the wide variety of morphs that each subspecies can exhibit. Here's the link:

Kousebandslangen.nl