It would be a pain to animate, but I'd love to see a cluster of pulsing xenias in the new program. I had a ton of them in my last marine tank and I'd watch them for hours on end. There's just something magical about their little "hands" grabing food from the water.
Here's a link to what they look like:
http://www.youtube.com/watch?v=chDXsuRlYoA