Additional fun things:
Blender markers. Prismacolor, Tombow, and Copic all make them. I have the Prismacolor blenders myself, and they do this when used in combination with the colored pencils:
Also, pencil lengtheners are available at good art supply stores (*cough cough Art Media cough* if you happen to be in the Portland, Oregon area….), and these come in REALLY handy when your pencils get to be about 2 inches long and downright painful to hold.
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Questions anyone?