Attached is an Adobe Illustrator template file you can use to develop your own watchfaces for the Sony SmartWatch 2. The graphics part is probably the more time consuming part if you're following Naheel's great guide without adding additional features. Hopefully this template can help speed up your design process.
Note that the template has layers in it to help you out a bit. Feel free to tweak and improve as needed. The file is from Adobe Illustrator CS2.