This is what I used:
Flocking powder- this was fairly easy to find on ebay. A tip for those without a craft supply source especially: I omitted the word "powder" and found it just by "flocking", it was much cheaper and I got a huuuuge amount- 1/2 ounce, which is enough for doing this 100 times. i.e. it's more than enough!
I tried using a small makeup brush but it was an absolute mess- the brush either got polish or the flocking on it and the brush hairs also shed onto the nails, so I gave up on that idea.
What I did was put some of the flocking powder into the little jar there, with the small hole on top. You could use tweezers for that, but I just pinched it together and put it in- it kinda balls up, well enough to get a good amount without making a mess. I applied two coats of a pink polish- same shade as the flocking. Then I put my painted finger over the bag of flocking so the excess would fall into the bag, and I squeezed the flocking onto the nail until it covered the polish completely, trying to get as thick of a layer of flocking as possible.
Then I used that little tube/syringe thing and it puffed air onto the nail, removing the excess. That's what the brush was supposed to do, only I found this worked a lot better.
And after about 16 hours:
I like it better with just one or two accent nails, I started to do my whole hand but by the time I finished four nails I decided the look was a bit too furry!