If you don’t feel like making your own, then just use the foliage nets made by the likes of Woodland Scenics – it’s what they use on their trees & a nice big bag will give you enough for a wood for, if not peanuts, then a packet or two of cashews!
I’ve actually been considering using this to make 3mm forests rather than clump foliage. Will have to give it a go I guess. Thanks for the link!
"I saw this in a cartoon once, but I'm pretty sure I can do it..."