Sorry if that comes across as being bitter. I looked high and low for earth colored silnylon (like the coyote brown) and finally had to just buy a commercial tarp instead.
If you want materials and colors that the big boys use, where/how can the DIYers get them? I think that's my issue with them.
"Civilization is the limitless multiplication of unnecessary necessities." - Mark Twain
“I go to nature to be soothed and healed, and to have my senses put in order.” - John Burroughs