I'm working on my "C" set of Doodled ATCs for the ArtVentures group.
When I think of the letter "C" I think colors. Cut various colors from paint chips and attached to card back.
Drew a large "C" on a different paint chip with a fine point black Sharpie and cut out. Used micron black pen to write some "c" words to mimic the "C" shape (they almost make a circular sentence). Drew some designs in different colored metallic gel pens as a 'C" shape in the center of the "C". Used white pen to add dots to the black lines.
Used same pens to create lines on the paint chips.
Decided to add white lines inside the "C", then attached to the background.