A few days ago, I did it. I submitted one of my poems to Deseret Book/Shadow Mountain Publishing and to Covenant Communications (aka Seagull Book). Because it's Christmas, I decided that maybe it was time to try. I don't expect that ANYTHING will come of it, but I figured that there was no harm in trying. If it's rejected, I'll try some other publishing companies and see what comes of it. The nice thing is that it isn't just for LDS readers. Spiritual yes, but very universial...to Christians anyway.
I wrote this a couple of years ago, and tried to make the verses match with 'Twas the Night Before Christmas as closely as possible.