Salesforce1, Samsung Gear 2
I expanded the Salesforce S1 Design System to scale to Samsung's Gear 2 smart watch offering as part of Salesforce's Wear Developers Pack.
When designing for a small form factor such as a smart watch you have to be careful to not over complicate its functionality. I paired down interactions and features so a select few were easily accessible and glanceable. Google does a great job of outlining this philosophy for Android Wear.
In this example I simplified our complex S1 design system to two simple primary features. Viewing the user's meetings and viewing the user's tasks for the day. The goal is to empower the user; not get in their way.