You're right, Michelle, I am sewing full-time. All the little AS self-addressed postcards I included - "if you need more let me know..." - are coming home and are keeping me pretty busy!
As for fabric, last year I searched extensively, but didn't find what I considered perfect fabrics (although I used some woodland too!). WalMart had a near perfect olive drab for $2.44 (I think it's up to $2.87 this year) which I used quite a bit of, but I finally have settled on making them all out of JoAnn's 45" tea-dyed muslin. Regular price is $2.49, but sign up at the register and you'll receive monthly bulletins with coupons, so bolts of 25 yds can be ordered at 40% (and sometimes 50%) off. You can order multiple bolts, as well, I've ordered as much as 150 yards that way. Incidentally, WalMart will also order whole bolts for you, the olive drab comes in 10 yard bolts, I believe.
I am disappointed to learn that under hard use, the ties only last 4-6 weeks. I guess I should re-think where I should send the ones I'm sewing now (as soon as postcards stop coming! LOL)
On the sand scarves (I've wondered what they are and how to make them! - glad to see instructions here!) my machine is an old Singer 211, and does not do zig-zag. A straight line of tight stitching should be good enough to stop fraying, shouldn't it?
Happy Sewing!