Only the way I've done it; both I Am poses from Will-o-the-Wisp and Dandy. The other element is to sit down and turn around, as more background items show that way, but some you can get away with by the default forward standing. I had that one taught to me by a friendly GCDer who often does invisi-avis. It's how I did my floating bottle avi smile Have fun being invisible!
Mainly because I was playing around with the sharkicane pose and trying to make invisi-avis with it ... My partner liked my sharks falling over the garden above my other options, as she says it looks like one shark is dead set on eating a pumpkin.