Should have updated y'all.  Using Bubblestorm worked out well on both my underwater covers.  Here's the one I was working on:

And here's the link where I have the e-book published.

http://www.smashwords.com/books/view/25243

I've also used it on my other Umira cover -- for which I haven't actually written the story yet.

Ah, the strange life of the writer/artist!

Thanks for all your help.

 Stephen D. Sullivan

www.stephendsullivan.com

Adventure guaranteed.  (Monsters optional.)