Sorry to those interested before, but my way of making the soul gems (a 3d printer) is not working the way I had hoped. I was planning on doing them as one piece so that I could get them lit from the inside so an actual gem would make it more difficult. As for weapons at con there are no stircter rules for selling cosplay weapons (i.e. non metallic) then at the spirit stores for halloween. On top of that I wouldn't be walking around with an arsenal in a trenchcoat, just precommissioned pieces being dropped off.
seriously not worth it to do the weaponry...
you can try your luck, but there was a strict rule saying all weaponry items should be with a costume attire.
even if its a made up OC version, they still ask!
learned this the hard way from stacy, closest to sell them is during the fanime con swap meet, but the items had to be used..
as for the soul gems, well
I have an idea about the glowing part that could be useful!http://www.flashingblinkylights.com/product_info.php?products_id=2287
problem is it only displays multicolors (but I know you want it to glow very slowly and NOT very rapidly)
if you mange to find a singular Aurora colors (known as led mood rings) it could be useful
not only if you can try and do something with that but maybe seek other alterations on creating something cool like
if this was kingdom hearts I would laugh and see if you can do those Serenity shards
anyway just wanted to let you know about it..
I know theres a different name for the lighted effects but it took me a while to remeber it since I got mines off from the discovery channel store back in 1999....
hope it helps!