Does the color of the poster board matter? Yes it does. Why? Because I want it to match my camera and not to look like a DIY from 10 feet. Other than that the color of the Light Scoop is irrelevant as far as I know.
A quick materials list:
Inkjet or Laser Printer
Poster Board - at least 8.5" x 11" (Black if you can get it)
Hobby Knife (& cutting surface) or Scissors
Double Sided Tape, or Hot Glue, or Wood Glue (In order of easiest and quickest to apply)
Reflective Material (Aluminum foil, White paper works well too, or mirror vinyl like I used,)
Step 1: Print template
I used a plotter which meant I skipped this step.
Step 2: Tape Template to Poster Board
Again, I used a plotter so yours will look different but you get the picture.