Recently I searched for hair styles on here, thinking...crafty people...crafty hair. And I saw a few other topics asking the same thing. So, I'm putting these up here only so I didn't have to find them all and reply to each and what not. Or because I'm lazy. Whichever.
This one is a variation of something I saw on a braiding site where they had two braided pigtails wrapped around eachother like a figure 8. You'll need pretty long hair to do this one...mine is an inch or two past my elbows.
http://dreamweaverbraiding.com <---the website. They've got tons of pictures of cool braids - but most of them i couldn't imagine trying to do to yourself.

I french braided it back, but you don't need to. Just take three even amounts of hair and tie them back whever is comfortable

It's a little hard to take a picture of the back of your head...but what you do is braid the three sections of you hair. Put the middle one into a bun, and bobby pin it in place. Braid each of the outer sections of hair as well, and start wrapping them in their own buns in separate directions. Bobby pin those in place. Take either one and wrap it over or under (depending on which way you started the bun) the big bun in the middle, and under the bun on the other side. Then do the same to the other bun, going over instead of under or vise versa.
The second one you don't need as much hair - just lots of hair ties.

It's pretty much a french ponytail but you cross them instead of going straight back.

Part your hair all the way to your neck (as they are pigtails). It starts out with two tiny pigtails at the front of your head. Then on one side you take another section of hair without taking what is already in the hair tie. take the hair from the hair tie on the
other side of your head, twist it a few times, and cross it over to the section you're holding, and tie it all together. Do the same to the other side of your head, and you should have a cross!

Do the same thing with the rest of your hair, so you just have crosses going all the way down. I did twists with the rest of my hair...all you do is break you hair into two sections. Twist each of them in the same direction, and then twist them together in the opposite direction. If you've ever spun yarn, its the same thing.
Whenever I go to six flags I put my hair in pigtails so i don't get blinded on roller coasters, and ponytails make it uncomfortable to lean back. So I have many-a-pigtail styles if anyone is interested.

Hope I helped someone or at least gave someone an idea...