This tutorial will show you a nice way to make a watery abstract effect.
1. Create a new document, and fill it with a nice blue color:
2. Using a small white brush, make some marks around your image like this in a new layer above your blue background:
3. Go to filter > Liquify. Drag your brush in the liquify filter to make the white marks appear rounded and swirled, like this:
4. Set this layers blending mode to overlay:
5. Go to filter > Distort > Wave. Click the randomize button, and then click ok:
6. Duplicate this layer, and click Ctrl + F to repeat the wave distort. Continue to duplicate the layers and repeating the filter until your results look similar to the ones shown below:
7. On every other layer with the white marks, go to edit > Transform, and rotate it so that the marks are not so evenly paired:
8. This effect is great for sigs and wallpapers. Keep playing around with it until you find results you like!
More Tutorials: 
