I have an idea for a MuleSoft Trailblazer Community Webinar:

Create simple text2speech API for Alexa.

• Discover a foreign API with e.g. https://www.programmableweb.com/
• Design API specification in  Design Center
• Import spec in Anypoint Studio and implement the logic
• Use RestClient like ARC to test the solution

That could be an interesting example and show the core parts: exploring an existing API, do the spec in Design Center and do the implementation in Anypoint Studio.