I currently have program called Daz Studio 1.7. It's a freebie located here at www.daz3d.com,
and there are tons and tons of content available for people to purchase that is pretty damn cheap. If you had something like this...http://www.daz3d.com/i.x/shop/itemdetails/-/?item=5387 and you have a little bit of patience to learn the program (it's a 3D rendering modeler, and can also be used to animate via posing and tweening, much like here in FX home) and you could, for a little pocket change, create exactly what you're looking for, and could then spice it up using a few clouding techniques with certain effects from FX HOME. I am planning on buying this particular effect capability by 8/23/07 and I could render something for you. What animal would you like done? I have access dragons, dinosaurs, gorillas, chimps, demons, wyverns (dragon-like, but not as big), and many other options. Let me know.