I felt a little inspired by this great little tutorial by Charlie Knight over at http://www.charliesgames.com
I used the Blob image and the Monster movement code to get the head of each Jelly to move around and then came up with some simple trig code to control the tentacles.
Very early days and not sure exactly what I'll do with this yet, but does look kind of nice :)
As usual, the best performance is witnessed in Chrome and Safari. Firefox and Internet Explorer exhibit rubbish performance :(