Occasionally I happen upon or end up creating something that I think would be helpful to others, but it’s not something that I think is worth a marketplace submission. I’d like to say, “here, have this thing I figured out so you don’t have to spend 5 hours googling and tinkering like I did”, but I don’t know where I can put it. Is there an appropriate place for submissions like that?
Post in the forum. Write up a tutorial, or post a screenshot of the setup or something. You could also put it up on the wiki
I just want to second this! Posting tutorials on the Wiki page or the Community Tutorials section of the Forums is a great idea to get feedback and help others!
If you have any trouble or need help getting your tutorials setup feel free to ask. We are more than happy to help! 
Tim