As well as designing your own monsters from scratch, another way of contributing is to add something for a monster that someone else has designed.
- Sprint 1 has our priorities for monsters that are missing one or more sprites
- Creature Progress Tracker has all named monsters that are missing one or more sprites
- Unidentified Monsters has monsters that haven't been named yet (which is needed for them to get their own page)
The Creating Creatures page has advice on names and design.