Many years ago when Miniature Quilts was still around, I just wrote them a letter & enclosed pictures & a few months later the pictures where published in the magazine, SO I WOULD IMAGINE it might happen the same way with patterns that you would like to share. They would probably contact you & have you sign a contract stating it was original etc.
Check out some of the magazine sites & if there's a contact us spot; go for it! Maybe even the fabric sites would be interested as alot of them post free patterns on their sites.