Its very easy:

You will need small tires of newspaper and alcohol

1-Paint your nails with a gray,white or lightgray color

2-in a very little recipe put somo alcohol or you can use a splash(in my case i use Victorias secret splash)

3-Put your nail inside the little recipe until it is totally wet

4-and inmediatily put the little pieces of newspaper on the nail and press harder for 6 or 7 seconds

5-retire the newspaper  and cover with a base coat and thats it

Hope it helps :)