Here are some sites that list a range of design workshops, activities and exercises…
- 18F methods
- Atlassian team playbook
- Google design sprint methodology
- GDS user research activity cards
- Design Kit methods
- Gamestorming
- Liberating Structures
- Think Design's research methods (via Rob Whiting)
- Team prompts
- Mental models for designers
- Design Games (via Nic Price)
Here are some links to specific design workshop methods…
Handy list.
A couple of possible additions:
Will have a think about other things I've used...