"Beachy Waves"???

My cute, cute, cute friend, Patty Cake, is going to be a bridesmaid for her sister's wedding in, like, a week. She thinks it would be pretty (and I concur) to have her hair long and wavy, a la Elle:

Vanessa:

Gisele:

or Kate:

So we've been trying to figure out how the heck to do it. I read somewhere that you twist a chunk of hair, then curl it with a curling iron to make it wavy. I wanted to try it, but I am currently without curling iron. Then I ran into this tutorial on YouTube, for "beachy waves" - the girl uses a flat iron! (And I like this tutorial because it has the song "Somewhere Over the Rainbow" in the background, but it's a different version - Hawaiian-style, with a ukelele - very nice.) So I studied the tutorial and then tried it:

It mainly turned into ringlets!! Who knew that a flat iron could make ringlets? My little-girl-hair-guru, Sue, always talks about curling her girls' hair with her flat iron, and I was like, what kind of funky-arsed flat iron does she have?? But mine did the same! As the day has worn on, the ringlets have actually become more pronounced. So...not exactly the look I was going for, but maybe if I move the flat iron through my hair more swiftly or something. I feel like it's a little bit too Early Nineties Karlenn, but I don't know. Ben sure likes it.

Do any of you know how to do this wavy look? Patty and I are going to experiment on Sunday night. I'd love your input.