Weekly Calendars! In each frame insert colored or patterned paper. Add the day of the week. Then using Velcro sticker, attach to one side of a frame including a dry erase marker. Now you can write on the glass of the daily note/reminder. Cool!
Repurpose an old bulletin board into a map. They did the United States in this one. You could do the continents and adhere theme to the wall. Thing about using a bulletin board is that you can then pin things onto the map. Cities, countries, names of people serving in the area, and so on.