An easy to use react-native component to render a masonry~ish layout for local and remote images with support for dynamic column rendering, progressive image loading, device rotation, and on-press handlers. https://github.com/brh55/react-native-masonry
This project is really great.
A pomodoro app, super fun, you can time things and pause and stop and count tomatoes.
This demonstrates a bunch of the native components that you can use in React Native core and Expo.