You can now (sort of) use Android Wear 2.0's complications on a Wear 1.0 device

An example of this is the work of reddit user seapip, who has developed a "hacky implementation" of Wear 2.0's complications, which are essentially non-interactive widgets built right into a watchface. While a few features are currently missing, such as the complication picker dialog, and there's also a number of bugs that need fixing, the feature seems to be working quite well.

Ultimately, the developer aims to make porting complications built for Wear 2.0 a matter of simply replacing two lines of code, which, unfortunately, means developers will have to explicitly choose to support the unofficial feature. Still, even if the implementation will never be an official-grade one, it's still great knowing that there's a community of enthusiasts out there which hasn't yet abandoned the platform.

source: reddit via XDA Developers