Hard to tell which dock apps are running / not running

[mcandre]

The colorized background of dock icons makes it harder for me to tell which apps are running. I would prefer that the dock icon backgrounds remain the same color regardless of icon content, and that the same color is used across apps to indicate a running app. This would make it easier at a glance for me to tell which apps are running and which are not.

Similarly, some applications have rather large dock icons, such as the Wunderlist browser app. When this happens, there is very little room for a background color, so any such change in the dock icon when the app launches / quits is barely noticeable. In the future, could Ubuntu scale down all dock icons to the same size, allowing for some padding for background colors?