I made a cool little Water Demo that plays the sound of water drops, tap, stream, river, waterfall, and even rain. Took me about an hour to fling in 500-600 lines of code to make this tiny 11kb demo. It works pretty decently too. I used multiple 1-30ms grains of sine waves that fade in and out pretty rapidly to give the audio a nice watery texture. You'll need Java plugin 1.4.2 to see it. If you don't have it, the applet will prompt you for it. It's a very useful plugin and you may find a lot of sites using it too, so you should probably install it.