Hello Ed and unittrain,
Of course I spraypaint the aquariafilterfibers !
Mostly in a , as you wrote too, a greyish-darkgreen color.
I tend do paint the fibers a darker color than the leaves I add on the frames.
Sometimes not: when making modelling trees or pine trees which are growing in "high altidude" and the background shows a blue sky with any clouds and light is very bright and trees are standing alone/solitar...you can see/more visable the small twigs/small branches .
here an example of an Acer/maple(?)
Just before adding the leaves of ( sponge) scatter or the ones from NOCH( Blätter):
Looks like a kind of "winter"tree
I added the smaller grasfibres with a strainer= lookin a litlle bit irregular...I think when using the NOCHstatic grasapl. you can make the overall look of the winter maple tree may be a lot better= most of the fibers will point to the outside / the periphery of the tree.
Here I used only the 12 mm and 6 mmFibres( wildgrass from NOCH)
and a big shrub/small tree before adding the leaves...
Jos