Is there a built in way to get the ColorPropsPlugin to hand back a number instead of rgb? See the codepen for an example of a quick fix that makes it tween with an extra function call. Click on the box to change the color. Also you will need to use a browser with webgl since there is a bug with the tint & canvas.
Also on a side note it seems to flash to white each time its clicked, which is not what I expect. That is not related to the ColorPropsPlugin, correct?