The fall and winter seasons are perfect times of the year to experiment with hair rollers (flexi rod sets, perm rod sets, curlformer sets, etc.) and master your roller set, since there isn't much humidity in the air and your hair won't get ruined five minutes after you've styled it.
I've written tons of posts on hair rollers, from which one is best for spiral curls to those best for loose waves.
Following are some of those posts that talk about achieving the perfect natural hair roller set.
Click each link for details
Choose the Best Roller for your Hair
Jumbo Flexi Rod Set
How to get Defined Curls