I prefer subdued colors like tans, sage, greens, or greys whenever possible. I've never needed to stealth camp for trespass reasons, but I generally prefer that I am not as readily seen. It tends to enhance the wilderness experience for me and other folks in the area. I avoid camo so that the people that I do meet don't think that I am poaching wildlife, cultivating drugs, hiding from the government, stalking people, etc.
That said, my bivy is eVENT yellow, the only color which was available when I got it. They make grey, but I haven't seen it in wide distribution yet. However, my poncho-tarp is green, so I can fairly well shield the yellow from view.
One of the common questions with the recent pre-sale of the Artic Dry Pack was "when will subdued-color replacements for the orange drybag be available?".
Also, some pretty helpful advice on the Make Your Own Gear forum here at BPL if you want to discuss technical aspects of the pack. Good luck. Post pictures.