I started using these Idiom of the Week posters this school year. My kids look forward to seeing a new idiom outside my door every Monday, and enjoy the fun examples and phrases I've selected. This file is editable, so feel free to change the example sentences to be personal to you and your kids!
I suggest taping the posters to larger, decorative paper, then laminating. I used small velcro tabs on the backside of each weekly phrase to easily change them out, and command strips to secure the entire setup to the wall.