There's a few ones already open sourced it:

1. https://github.com/dbacinski/Design-Patterns-In-Kotlin
2. https://github.com/takaakit/design-pattern-examples-in-kotlin
3. https://github.com/odaridavid/Design-Pattern-Samples-App (showcase in Apps)
4. https://github.com/AlexeySoshin/Hands-on-Design-Patterns-with-Kotlin (from Packtub)

is it possible for us to contribute as well? I do wants to try if it's Kotlin :)))