I was actually doing fishbone braids before everyone else caught on and decided that it was cool, unfortunatly I cut my hair off as a cute little freshmen and its still not long enough to get a really pretty one. And it helps if you don't have as many layers as me.
HOW TO FISHTAIL BRAID: You divide your hair into 2 equal sections, and take a piece for the outside (or back) of the strand, cross it over, and add it to the next one. You just keep doing that all the way down. The smaller the pieces, the cooler it looks.