This is a poster set of phrases that students commonly use in the classroom plus a corresponding poster that replaces the first with a positive phrase or thought. I introduced these in my class with a short discussion on the power of our words and thinking. My students use these regularly now and refer to them throughout the day.
"I'm done." - - - - "How can I make this better?"
"I'm awesome at this!" - - - - "I should try a different strategy I'm not as comfortable with."