Happy to help.
I have tried the twisting techniques and they work reasonably well:
The large turft in the centre is a twist and super glue creation. However, they are only any good for tall tufts at this scale (elephant grass in fact).
The slightly lower tufts in this picture are from a door mat and the lowest one (bottom left) is a Noch tuft. These are really good but really, really expensive. Literally more than their weight in gold.
In this second photo you can see a silflor two coloured tuft (centre). These are really good and come in a much wider (indeed random) selection of "poses" than the noch tufts and for a fraction of the cost. Go for a mix of the small packs as you will take a long time to get through one of these packs. I wouldn't bother with the Noch tufts anymore having now see the Silflor (though the two do mix well).
The site is a great source of everything you could possibly wish for for dioramas and I have had no prolems at all with ordering from them.