The crystalline one was made by taking the first (non-'tarnished') armor model I posted before. Then I changed the diffusion color and fiddled with the transparency and reflection til it worked out.
A lot of what you're seeing ISN'T actually there, it's reflections.
The model is identical, it's just the material that's different.
Not sure how easily I could duplicate it; depends on the image I guess.
Phoenix-D