OK...How open-minded are you when it comes to design origin?

The native cultures of the Pacific Northwest (Haida, Tlinglit...) have some of the most stylized images for ravens and bears going since animals figure heavily in their mythology and religion - especially Raven.

What about blending a pin/brooch of their design. Yeah, yeah - not Celtic but I think their styling might blend with Celtic design fairly well. Take a peek:

http://www.dharmarose.com/store.html
http://www.davidmorgan.com -- go to the Jewelry page; also has Celtic

Not vouching for either vendor - never dealt with them. But their wares might give you some ideas.