Math isn't about getting everything done as quickly as possible. It's about playing with numbers, toying with strategies, making connections, and having fun learning about the world. These kinds of realization can help students engage with and become passionate about math…not to mention promote a growth mindset regarding their learning.
These inspirational 11x17 posters are based around 5 quotes from Jo Boaler, whose book "What's Math Got to Do With It" acts as a great resource for teachers who are eager to question "traditional" models of mathematics instruction.
All would look great mounted on colored construction paper and then laminated!