I saw a link to this idea on Pinterest and was gung ho to make a brand new prayer board too! And then I realized I already have something that will work just fine. We have a framed chalkboard near the back door. Sometimes I write messages on it, or notes to my husband (or he writes to me), or sometimes I write scripture to memorize.
I decided to turn it into our prayer list. I grabbed a pad of Post-It notes, sat down with Katie, and asked her what she prays for. I told her what I pray for, and we added some items to our board. I put a date in the bottom corner of each Post-It note. When each item has answered prayer, I write the answered date on the back and save the Post-It as a visual reminder of how God answers our prayers.