Well, my first attempt at creating some king of nature-themed slideshow with music is done. It's called "Caverns" and is based on - believe it or not - a lesson I gave students showing them how to use a one chord ostinato pattern.
It's the first time I used Windows Movie Maker too and I have to say that it's very easy to use!
The music is free-flowing and uses right hand crossover technique to hit bass notes. The melody is improvised. And yes ... only one chord is used in this - D minor. It's actually in the D Dorian mode. Please tell me what you think in the YouTube comments section and rate this video.
Find the video at http://youtube.com/watch?v=bAOMBvylL-Y