Also Great: A Gel Pen Set That Includes Metallic & Glittery Colors: Soucolor Gel Pens (60-Pack) Here are some of the best markers for adult coloring books — plus a set of gel pens with fun ...

Set up a coloring station with crayons, markers, colored pencils, or even watercolor paints for more creative options. This way, everyone has plenty of tools to choose from, making the coloring ...