I made a Tutorial on deviant art when I first started making them, but I have improved on it or at least made it easier on me to make them in one whole piece.
This little octo amigurumi is probably the easiest to start off with if you have never crochet in the round before. It simply is a ball, with spirals attached if you fallow the tutorial I made earlier. The adjustment I made to make it easier is incorporating the spirals into the ball. On the first decrease row after each decrease (you work the decrease and pull the loop threw three loops) I would chain a length about 22 ch and put 2 DC in each stitch up or more depending on how tight you want to make the spiral part of the whole body then sc into the next st fallowing the pattern for dec and sc's. Then on the next round the decrease should fall right at the spirals so you just pick up a stitch on either side of it and decrease. Working it this way will leave you with 6 legs, but you can always adjust the pattern to fit in 2 more I just prefer it this way as the spacing with the decreases works out looking cleaner.
Feel free to use my pattern and give credit to me but DO NOT claim it as your own or sell it if you want to give it to someone link back to here or my DA please. I ask if you want to sell anything made with my pattern please donate part of your profits to a local No-Kill Shelter or Animal Rescue group even just $.30 will feed a hungry animal for a day. Not necessary but its a kindness I pay forward by not charging for the pattern.
Below are some of my Octo-Jelly's I have made.