I like the new colours in X3 very much, and I also very much appreciate and use Panu's mods.
There is one difficulty I have with colours: identifying the track(s) armed for recording at a glance. The little white area is just too, well, little for me to see without taking the time to look quite carefully. I would wish for the whole track or tracks to change to a pre-chosen (by the user) colour/text combination as soon as record arm is selected, the same combination to be used on any track that is armed for recording. The user would naturally avoid having any other (non-selected) tracks use a similar combination.
For example, let's say my colour selections are all fairly pastel blues for percussion, yellows for keyboards, greens for guitars, etc. Well, then I might choose a bright red background with black text for any track currently selected. So, if I select a green guitar track, it would instantly turn red and I'd see the text in black.
Maybe being able to keep the same colour as originally chosen by us for each track would be better, if we could dial in a different intensity of colour to be used when the track is selected. For example, if the shade of green for my acoustic guitar is of medium intensity (say 5 on a scale of 1 to 10), I could choose to have it change to an intensity of 1 (almost white) or 10 (extremely dark).
Anyway, that was my two cents' worth. I'm very, very happy with Sonar X3d but my oldish eyes do struggle with that one area.
LJ