Twinkl has a great selection of resources
There are some great examples of displays on the search engines - this is one of my favourites (source unknown)
Class Dojo is an amazing behaviour management tool but also as a means to encouraging a growth mindset culture. Within the site you have the option to edit the positive points to reflect growth mindset characteristics such as persistence and self belief. More recently they have also added some amazing growth mindset videos.
This is a great display to illustrate that making mistakes is not only part of learning it is an essential part of the learning process, problem solving and mastering skills.
Sarah Hagan (@mathequalslove)