So of course because I love Etsy, I looked there first, and it didn't take long to came across exactly what I'm looking for. It's just a simple palladium band (my set is platinum, but palladium is part of the same metal family) and I think it will complement my wedding set perfectly, don't you (pictured below right)?
PS- For a better picture (ie, not taken with my iPhone) of my engagement ring, visit this post. No picture has been able to truly capture the crazy amount of sparkle that radiates from my rings, but the pictures in the older post are more true to the ring than the picture in this post).