Corbin Davenport has posted plenty of awesome Android and Android Wear hacks to his YouTube account in the past. His latest video shows how you can run an old version of Mac OS on your Android Wear watch. The Mini vMac II Emulator was used to pull this off. It emulates the Macintosh II which was released by Apple in 1987.
As you can see in the above video, this solution is not perfect. Such an old operating system is not exactly smartwatch friendly. For more hacks, you may want to visit Corbin Davenport‘s YouTube page.