This tutorial was incredibly easy. There's a YouTube video linked on the page. It doesn't say how many bands exactly to grab; just long enough to fit on your wrist. I had around 52-54 for the project.
Rainbow Loom Bracelet Black and Green Fishtail by LetsBandTogether, $2.50
Fishtail Rainbow Loom Patterns - my boys are so into this right now. I will have to share this with them tonight.
Make your friends and family some beautiful DIY jewelry with our Rainbow Loom Fishtail Bracelet video tutorial. With clear and helpful instructions, you will be on your way to creating some really gorgeous bracelet patterns.
How to make a fishtail rainbow loom bracelet - http://rainbowloomsale.com/how-to-make-a-fishtail-rainbow-loom-bracelet/
I've seen some of these bracelets. I could totally do it with a bunch of hair elastics
Fish Tail Stretch Band Bracelet: Rainbow Loom, DIY, Tutorial, loom and bracelet instructions
How To: Make the Rainbow Loom Fishtail Bracelet!
Rainbow Loom-Multicolor Triple Single bracelet for beginners-STEP BY STEP - YouTube
Rainbow Loom Fishtail Tutorial