This one isn't mine, but I have a board like this in my classroom this year. It's great - it's basically a thesaurus on a bulletin board. I teach fifth grade, but this would be great for younger grades that may not be ready to use the actual thesaurus - they can still use, as I call them, "fancy words!"
Also on these boards
Create the word wall around the classroom. It is an engaging way to get the students involved in learning a new word each day because they get to add a piece to the word wall and make the caterpillar grow. The answer to my insufficient wall space!! Love it )