On my word wall, I put small Spanish words that come up all the time in stories and speaking. Instead of assigning these words as vocabulary that they are tested on, we refer to the word wall as needed. It is never covered up and is always available for their reference.
When I'm teaching a lesson, such as a TPRS lesson, and one of those words comes up that the class hasn't heard or used before, I will use my laser pointer around my neck to point to it on the word wall as I say it so that they can continue to comprehend my story without me needing to break into an English explanation. I love it!
I'm really interested in different kinds of word walls and how they are used in the foreign language classroom. Do you have any word walls in your classroom? If so, how do you use them?