The site I found said blue/green dragon, and I went with green to more emphasize the connection to the earth element. I know Japanese traditionally only had one word for both blue and green, so I assumed Chinese might be similar.
(Also... it just looked better green in this particular set. Artistic license. *shrug*)
I hadn't thought of that-- the intent was mostly to sell them as prints-- but I'll definitely keep that in mind. I'll have to find a place that can make pendants first, but you're right that they would work well.