I've never been able to make my concept boards very exciting - I still don't really get them - but for my animal board I purchased a leopard pattern shower curtain for a background and framed it with pictures of jungle animals I cut out of calendars. Bought everything at the 99 cents store or Pic n Save (very cheap). Then, in addition to the questions and answers, I put all of the vocabularly words on cards and posted them next to the concept board.
It doesn't seem like many people on this board use OCR. That would make a great board in itself.