First, select the Dazzles you want to use and place them on your cardstock:
Then, just begin to put spots of color in different areas. I like to use the metallic and pearlescent water colors by ArtQuest. You can try this with Twinkling H20s, or Smooch too.
Now start with another color:
Continue with a third color if desired. You don't want to go too crazy with too many different colors! You'll want to blend the edges where the colors meet one another so the effect is smooth.
Here's another example where I colored in only the image, not the background: