I've played around with mixing/matching themes with the animations. It's a bit of work but I've been successful on a couple of them. You can basically create a new theme. I would make a new folder somewhere to try this. It's kind of a trial/error procedure but you can find all the theme files in My Documents/My Shozam themes. There you'll find all the themes for Shozam. In there is a flash folder. That's where the intro animations are. In the images folder is where the backgrounds for the animation are. The themes.css file is also there. What I did is just copied a theme I liked to a new folder then copied the background and animation file (intro.swf) and the theme.css file from another theme into the new theme folder I created.
Another way is to use the editor in Shozam and pick another animation file to display. You might have to copy just the background from another theme for it to display correctly. We like to play with Shozam a lot and see what all we can get it to do. None of this I've mentioned is guaranteed to work. Always work in a new folder and anything you mess around with save as a new theme so you don't mess up the original. Any new theme you create will be in My Documents/My Shozam theme under the name you gave the theme.
Another alternative is Coffeecup Firestarter (coffeecup.com). It's a fairly inexpensive program that makes flash movies. I use it to make mine. I'm not into the learning curve of Swish and some of the others.