Glowing LED Green Lantern Ring

I found a pretty cool instructable today on how to make a Green-lantern like glowing ring using resin and an LED.

One of the first things the creator Honus mentions is that he can not sell the item.

I would guess its because its a copyrighted symbol of the comic book owned by DC comics.

But if it was just a ring that glows a particular color, it should be ok to sell, right?

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