We've done alot of suede painting now with great results - you just need two people, and to move FAST.
First day apply a base coat with the RL roller (I actually really like the roller because the paint is so thin that the sheild limits spatter - this is important in the second coat).
Once your first coat is dry (and it will look patch and poor), start your second. Person #1 rolls on a HEAVY, THICK coat of the paint, working from ceiling to floor, while person #2 follows behind making the X's, of random size and orientation, in the thick coat with a dry 3" brush. As the brush gets wet and sticky the effect only gets more dramatic.
Like I say, we've done this a few times now with great results. I think the key to the whole effect is just SLAPPING the paint on the wall randomly and without alot of care - just because it's from RL doesn't mean youu shold be to careful.