First step, gather a bunch of print matter with varied fonts, styles, sizes, papers, and lines. I cull magazines and my GOOS (Good On One Side) scrap pile. The GOOS pile always makes for an engaging archaeological dig: old reports, practice maps for student geography tests, a personal narrative, estimated tax forms, intake sheets. Great fun.
Next step, tear pieces and affix them to a substrate (watercolor paper, in my case) with matte medium.
Then, veil the collaged substrate with white acrylics thinned with glazing medium. Also great fun, and surprisingly freeing.
Next, introduce a thin layer of neutral color. I mix cadmium yellow light hue and titanium white, and Payne's gray and white, and move back and forth between the two, letting them blend. After that, provide a touch of color. I add a thin layer of liquid yellow ochre and glazing medium to warm it up a bit. Before the paint dries, I blot away paint in some spots to allow more hints of print to show through.
Gotta have layers to stay warm in cold weather.