This idea really connects special triangles and the unit circle. I did something similar with my students and that's when they were able to start understanding why the signs change but the values don't in different quadrants.

Puzzles, also to remember to get a puzzle with as many pieces as students, give them each one and see if they can put it together one piece at a time.extra Pieces are rewards. Probably need glue dots or some way to solidify.