Curls are cute! Curls are volume! Curls are oh so common in Lolita fashion and other dolly looks! However, as somebody with naturally straight hair, curls just don't stay for me. I've been testing out heatless curling techniques for ages, from covering my head in mini-buns (so difficult to sleep on) to using foam rollers (got the ends tangled) to heat styling with curling wands once by a hair stylist for a fashion show, and once at a salon for a tea party. Neither professionals were able to keep my hair curled for a day. And that was not even curling my full hair length - I had my hair up in buns (think Sailor Moon hair, but with the pigtails only reaching my jawline.)
Since then, I've settled for just making waves by braiding my damp hair into two to five braids depending on how small I wanted the waves to be. But still, I dream of curls~
I've tested this new method out four times now, and it has worked every time. I used no hair products at all, so I'm sure you can get a neater or more voluminous effect with various fluffing sprays, styling hold mousse, curl enhancers, etc.