The answer has been given to you, simply submit it to any established Magic publication be it a physical magazine like GENII and LINKING RING or an on-line source like VANISH or, if it were of an appropriate theme MYSTIC MENAGERIE.
Technically, if you share it on a forum it has been published but that tends to be a fickle point.
A lot of times when I have such brain-farts I'll simply share it with about six or so close friends so that we can witness things for one another and too, they can verify originality for me when it comes to the effect itself as well as method (we really try to keep an historic line of credit with things, which is another layer of integrity one should consider when developing a piece for publication or general release).
I will give you major kudos for wanting to do things in this manner, it's old school!
In the days prior to the Internet one submitted effects & routines to the major publications in hope of getting published; not only would this protect your effect but it likewise helped build your name (brand) so that people learn that you produce good stuff (hopefully) and they can depend on what you bring out. Many a notable built their career foundation by delivering constant concepts through the press for a year or two before marketing something; as one notable puts it, "That can mean the difference between a $25.00 retail price and a $55.00 price" (a.k.a. more money in your pocket via royalties.)
I'd be more than glad to take a look at your material, help you compose an article and walk it into the editors & publishers I work with, just PM me if you're interested.