Hmm... Ok... I have a thought, since you posted that stingray picture...
Please excuse me if I just build on you mermen's ideas for a bit, I am not a dude, and my own dude leans towards feminine, so I don't always know what all the other mermen want in terms of accessories :P
I was at Tandy leather a while ago, and they had stingray leather in ALL SORTS of colours (all I can find online is black:
http://www.tandyleatherfactory.com/e...yword=stingray). These hides were small, expensive, but BEAUTIFUL. It was some of the nicest hides I've ever seen, with this interesting pebbly texture
I also have been looking at making LED clothing and accessories for ages now... the only reason I haven't experimented yet is because of funds >.<
Now, I wouldn't say to make LED things that will get wet, but for a dry event, I think something made of the above stingray leather and LEDS would be fantastic on a mer-man!
For water use, first of all I would try to make a synthetic stingray skin, haha, since that leather is no good with water. There are all sorts of strong (bright), long-lasting glow pigments you can get these days... either paint it on, or embed it in the silicone/whatever you're making the stingray out of).
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