Like many I am in love with decorative tape, including the new Japanese Masking Tapes. It’s quite easy to make your own though.
I placed strips of tape on the waxed paper and added watercolor paints.
From left to right:
yellow: black Souffle pen
orange: silver Pilot paint pen
red: Faber Castel Pitt Artist Indian ink brush pen
dark orange: just watercolor paints, the key to blending is add more water between the colors
green: this was a more fabric type of tape, I found it hard to work with, I liked the edges though
green: clear Aquatip pen
blue: stamp with Brilliance ink
green/blue: white glue (creates a batik style)
wide green/blue: brushed on drier watercolor paint
white: painted with black watercolor paint
blue: cheap kids watercolor paint, felt grainy and powdery after
purple: cheap kids watercolor paint, felt grainy and powdery after
As you can see, anything seems to work. Play around with various mediums and let me know how they work out!