You start out by drawing a, slightly wavy, line across the page. This is you starting point. Then you start by making loops from this line. It will take a while, but I find it kind of meditative.
When you have filled the whole page with loops, you can really see "the worms" pop out of the page. Cool effect! :)
After that I used neo colors watercolor crayons and watercolor pencils to create this shadowy effect, and a lot of water....
(The photo is taken after I work with Dylusions mist on the opposite side... and it got a little bit messy...)
Isn't it coool?! :)
And here is the video on youtube, so you can try it yourself. Enjoy! :)