Google released new guidelines for dark and energy saving color codes to use in Android Wear apps.
There are a lot of nice colors.
I want to show with these colors an little tutorial of using color changing in watchfaces.
The color Codes are here:
http://www.google.com/design/spec-wear/style/color.html#color-dark-color-palette-for-wear
I made a four step tutorial to use this color codes in your watchfaces:
Start here:
Tutorial: Changing Colors of watchface Elements by tapping
Step 1: Editing script
Step 2: Change Color of objects
Step 3: Create Tap Action to change colors
Step 4(Optional): Show name of Color in Popup