What works for me for mud is talcum powder mixed with MM leather for a semi wet appearance, or flat brown drybrushed with armor sand for drying mud. Rope is also easy to do and fairly inexpensive, you probably have the basics for it hooked up to your stereo... I use the copper strands of speaker wire, 2 or 3 wound together and painted flat brown, washed with a thinned darker brown mix, then drybrushed a few times with tan; It results in a very convincing rope.
Another thing that works well for camo netting is medical gauze soaked in 50/50 water and elmers glue, then painted od green... You could also enhance it by adding some crushed dry leaves or even basil or oregano to simulate actual fallen foliage on it.
In addition to using fine jewelry chain, again you can use speaker wire strands, but don't wind them too tightly; When you get it to the length you want, use a set of pliers to flatten the wire... You will see it replicates link chain well, especially for 1/35 scale.
Hope this helps