I say "Bulletin Board", but I actually have these on my white board.
To tie in my detective theme with my administration's desire for us to post our day's objectives, I came up with the idea of listing the day's "Mission", and then also having a place for the students to record things that they've learned ("Discoveries"). I will reward sincere, thoughtful responses.
So, this is a 12" x 18" .jpg image that can be printed at Costco (they do all of my printing for me). It will then be cut in half, horizontally, to create two different headers.
Mine are laminated to avoid dry-erase dust damage.
I also have several other detective-themed products in my store. I hope you'll take a look! :-)