I saw this photo and I was reminded how I make my easy relaxed curls. Basically, I take my already straight hair and roll it up using two fingers and then pin it in place. I do this all over my head until it looks like the above photo. I leave it like that while I get ready to go out, think shower, get dressed, do makeup. The last step before I go out is to take each clip out and finger comb my hair into place. Afterwards, I have big relaxed looking curls.
This works so much better if you use a little bit of heat first. So if you are blowdrying your hair in sections, once you finish a section roll it up, or if you are flat ironing - after you finish a piece roll it up while it's still warm. But of course you don't have to use heat, you can just roll up your hair and then give it a very little mist of leave-in conditioner, followed by a light hair spray. The objective is to set it, not make your hair wet.