People vary in ever so many ways right around the world; in art, in music, in expression.
That being said, sergeants are much the same in every army (whether feldwebel, itto heiso, sargento or the like). There are rules to things military, and one of those rules is that, since it's the Government's property, we paint everything that is not polished (and even whitewash the rocks, too <G>).
I'd be willing to bet money that the feldwebel in charge of the supply line that got standardized pioneer tools on Pz.Kampfwagen probably saw to it that the correct number of coats, Finish Paint, 1 each were applied over the coat, Paint, Primer, Protective, 1 each before releasing same to the truppen.
So, probably, the tools were dark gray, or dark yellow, and after '43 some sort of mix of the two. The mounting brackets obviously need to match any camo, but, for the rest, get out all those 'other' colors that are not quite the ones you use for the "real" paintjob. Like that jar of panzer grey that is too dark, or the one a hair too purple, and so on. or that gunship or compass grey you got for some other thing.
Or not; lots of folk like the look of dark brown wood and a plain steel color for pioneer tools.
Note, tow cables are generally oiled plow steel, which is not going to be paintable. Note, too, that Tigers used those cables a lot. The skinny ones were used for pulling on & off the narrower transport tracks. Tigers have a reputation for needing those two cables, too, so they'd get used, a lot. Whether those cables got put back neatly in all those brackets all of the time is a different sort of question.