This easy nail idea is my take on Halloween nails. A combination of crackle and ordinary polish. Here is how I did it.
(Because everyone knows we are supposed to do Halloween nails in September, and I am no exception. :D These pics are from September, I just didn't post them immediately.)
I colored the nails green, then applied ordinary black polish on the lower 1/4 of the surface (I didn't want any cracks there).
Then I applied black crackle polish to the whole surface. When it dried, I added more green on the tips in two layers (this green polish is thin so it ended up looking well blended).
More about crackle polish: Pink Crackle Nails