There is another option that nobody has mentioned. The Parshendi shard blade.
The blade was described as being "wicked and barbed, like flames frozen into metal." (p. 930). and I am pretty sure it was quite large too. This description has quite a different feel from that of other blades, as they usually are described as having flowing or wavelike lines/forms.
We never saw the parshendi's eyes so there is no way, as of yet, to tell if his blade turned them light or not. Dalinar saw his face from afar, and didnt mention anything about the eyes, but he had stated that he couldnt make out the parshendi's features.
So the three types could be:
"common" Shardblades
Szeth's type of shardblade
parshendi type of shardblade
I think the honorblades are different and are not considered one of the three shardblade types. Especially since there are only 10 of them.
