It's hard for me to believe I never tried drawing with water and dropping ink into the wet shape. Such FUN!  It reminds me of writing in invisible ink as a child.  This is a perfect use for the brown toned ink with metallic particles in it.  I've posted an additional image at the bottom and I hope you can see the flecks of metal reflecting in the light.

I already had an art box for my godchildren, Baer and Piper.  After watching Rebecca's class, I dumped out the overstuffed box and minimized the supplies while still giving a couple of options.  I'll switch it out next time by replacing the colored pencils with watercolor.  

Thanks, Rebecca!  This class is great.