I don't think crackles are dead. There's a time and place for them. They're fun to get a little creative with too, like how I incorporated it into my fishtail braid yesterday.
Crackle_gradient (3) WLcopyToday, I've used two different blue crackles to create a gradient effect. I used OPI DS Temptation underneath and OPI Blue and Turquoise Shatters on top. Because you really only have one chance with crackles, I simply brushed them on. Blue at the cuticle and turquoise at the tip.

Crackle_gradient (10) WLcopyAre you over crackles or do you still use them in your designs?