Colorful Tube Worms - Op Art by Nalinne Jones. CHALLENGE WINNER in Rainbow of Colors in Art Colorful wormy squirmy tubes, mezmirizing and vivid, optical art (op art), ink and colored pencil by Nalinne Jones. I found an amazing and easy tutorial on how to make the tubes on StumbleUpon, then colored it with colored pencil. Here is the link: http://juliannakunstler.com/art1_opt_des.html#.... Simple, yet repetitive technique. Fun and addicting to do!