I sometimes think about what things I can put on my walls that are not your traditional math posters.
Word walls seem to be a strategy that work for some teachers. I tried something similar this year with a Function Wall. I teach Algebra 2 and what I did this year was every time we learned a new function, I hung up that function’s poster.
I thought this wall worked well this year. First off, it reminded students all of the different types of functions we learned. Also, just them seeing the different functions helps them remember the shapes of the graphs. The thing I liked the most was if we were trying to model a situation with a function, I could point to the Function Wall and ask student which one of those functions do you think would best fit this situation. Anyways, here are all of the files for the posters. I had all of them printed for $3/poster from this site.
Informal Math 
I just checked out your dropbox for the posters and the file was empty. I’m trying to get some better posters for our school. Do you have suggestions?
Sorry, I ran out of room in my Dropbox account so I moved everything to Google drive and never updated the link (I just updated the link). There are other posters in that folder that I have used before. As for other ideas, Matt Enlow tweeted this, https://twitter.com/CmonMattTHINK/status/716279168980353024, out the other day and I thought it was great. Hopefully this helps.
Thank you for sharing this would be awesome to have in my classroom for my Algebra students. What size are your posters by the way? They seem like a good size.
Thanks so much for the poster!