spiraling

You need to use a fairly small curling iron and curl your hair with the iron at a near vertical angle to your head. In other words hold the bottom of the iron towards the ground.

Don't try to get it perfectly angled or you'll burn yourself.

Or you can just curl as you normally would (roll the hair). But instead of just releasing the clamp, loosen the curl a bit by opening the clamp to release some hair. Then pull the curl (the tip) out. It's kind of hard to explain but it's like turing a curl inside out.

Then again you can always use hot rollers. If they are small enough, you'll get spirals every time. I like Remington Twisters.