I prefer neutral colors or earth tones. I'm not really into bright colors for any of my personal things (clothes, truck, backpacking gear, etc.). I don't really want to stand out or draw attention to myself. At the same time, I don't really care what others chose to wear, etc. Whatever floats your boat.
I find having a dull green pack, tan/gray clothes, gray sil shelter, etc., I blend in to my surrounding area very well. Makes for easier discreet camping without drawing attention to where I'm camping.
For those instances where I'm hiking during hunting season, I do have a couple of brightly colored items that I could use instead of my normal gear (like the BPL absoraka pack instead of a ULA) to get a little visibility. In the event that I got hurt while out hiking, I think I could find any number of ways to "signal" for help even with my mostly drab gear/clothes selections. For isntance, my NeoAir pad seems plenty bright for flagging someone down.
With respect to the original comments on Patagonia's selection of only bright colors for their clothes, it seems to me that they usually offer at least one or two neutral color options. Almost all of my clothes are Patagonia and I could probably count on one hand the number of items I own from them that are brightly colored. It may not be offered every year, but the basics like the houdini, down sweater, etc. are offered in non-neon colors from time to time…