I personally like it that way. It's a color that wouldn't hurt your eyes even after long time exposure. Also a colour like grey doesn't influence you into liking particular kind of sounds. Colours matters a lot. I don't like working much in studio one 3 coz the color seems to be influencing me in everything from sample selections, patch selections to mixing everything. Eventually everything I try to make in s1 ends up sounding thin, with a lot digital feel. Not a bad option for everyone. Some might like it that way.
Someone's I import some of my final mix into studio one and listen to. I get a feeling that I would have never ended up creating the song like that if I was working on it in s1. Its something psychological. You can try if you wish. Any fat kick or a kick with bit boost in 8-10kHz. Will sound ugly while looking at studio one interface. Console emulations sound ugly aswell with higher drive. You will only like thin sounds thin sounds mostly. And you will be more drawn towards synth sounds than, acoustic sounds. Some say it might be the sound engine causing this phenomenon. May be. But I belive it has a lot to do with the the colors and the way the interface makes you feel. One very experienced engineer accepted this while I had a conversation with him. He said he ends up making most of his mixes more bright while working in protools and more dark while in logic. Most people who program orchestral music love working in cubase. This is also a prime reason behind that. Cubase interface has a nice feel for orchestral music.
And I love the grey colour of Sonar coz it doesn't seem to influence much at all. It only gives a very balanced feel. Kind of a similar feel you get when you are behind a ssl or neve desk. I can listen to the audio for plainly what they are. Believe me is true. Grey is the colour for audio!!