NotBridge4

Also, Shardplate and blades glowed before the Knights Radiant were disbanded. This implies a link between the glow and honor and by extension, the shards. On top of that, the shards are described as works of art, and Odium doesn't strike me as the artistic type. Given all the evidence, it seems unlikely to me that Shardplate and Shardblades are creations of Odium.

Good theory. Personally, I always held the belief that Gavilar died before he could finish the sentence, but Dalinar and the others interpreted it as a complete sentence due to the way Szeth wrote it down. I think I like your theory better though.