Ratatouille
This movie just has a very special feel to it. There's an eeriness to the first act that feels cold and incredibly enclosed, but it quickly transitions into colorful hopefulness, whimsy, and freedom. It conveys so much emotion through the colors and environments. Just endlessly creative.
I've loved this movie since I was a kid. It's evolved with me as my lens has changed. I loved it as it was back then and I love it for what it is to me now. Really great stuff.