TM:

Even the grey will work, but I found a big sheet of the "light pink" at Boeing Surplus in Renton. What I use to "punch it out" is a 270 shell, that I've filed super sharp, then just sit and watch TV, and punch out as many as you want. The orginal piece was about 24" x 9" x 2". I've tried then at different lenghts, 1/2, 3/4, 1", all seem to work. The 1" probably easier to "get the fuzzy yarn" in but can be done with the other sizes also.
Walmart has some "kids toys" about 3" x 5', in the different colors.

What I was trying to do, put an idea in your mind other than the "white". You want the material that will hold "shrimp oil" then just play with colors of yarn.

PS......I use that 270 shell but you could go bigger or smaller.

"Worse day sport fishing, still better than the best day working"