There is a way to do that. By default the color of the machines when they are built is the first color in the color option menu.(Top Left) Just change the very first color option to whatever you would like and it will turn everything you build to that color combo. That does not apply to things you have already changed; you will have to set them back to that first preset or just use the same color you would like but on a different preset.
If the color doesn't change automatically; using the destruction tool and highlighting over the object will force an update and change the color back.