The one has been done before, I'm sure, but I didn't have a version, so I made one. It has been tested in numerous study groups (i.e. - got me through my summer cources) and was found to enhanse study skills in control groups (my three year old daughter stayed out of the room because it was "too creepy" for her...

For watery textures the vocoder is the thing to try. Putting noise into both inputs of the vocoder invariably gives something wet on the output. The reason is simple, the noise is split in bands and these bands are 'wobbled' exponentially in amplitude by the noise in that band giving a watery texture. The more resonant the filters in the vocoder the better it gets. Quite subtle changes in the noise can make big difference in the type of watery sound as the vocoder tends to emphasise small differences. Depending on the type of noise all sorts of rainy, splashy or surfy sounds can be made.