When you go to a custom framer they have corner samples to help you visualize your options. You can go simple or ornate depending on the style that will work best with the room you are hanging the artwork in. Below is one of my prints being framed at Framagraphic by the talented framer Caitlin.
Framagraphic is a great local custom framer on Broadway (Vancouver) . Here's their site: http://www.framagraphic.com