I've seen a video with data mined shadders and the previews for them all. Honestly there are about 20 unique ones and like 40 small variations of the main 20
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if you go to the destiny shader site there are a purty vast number of uniqe shaders...though I didn't count myself...there should be more available though and im really dissapointed with the availability of them at the current moment...shaders shouldnt be an exotic item...period...