I don't know if anyone has already posted this but:
I made a simple stuff sack with $4 worth of materials. I got one yard of camo fleece and a pair boot laces. The fleece is nice and soft and makes a purrfect pillow and the boot lace is used as the draw cord. I've replaced most of the draw cords on my bags with boot laces (I can't use a draw cord as a bootlace). I keep extra socks, hats, etc. in this stuff sack. If you wanted to, you could take a regular stuff sac and sew the fleece on the inside. And then at night just turn the sack inside out and fill it with clothes for a pillow.