If you go to Michaels, JoAnn or Hobby Lobby, go into the Material department and find the bolt (I think that's what it's called) of Organza. These stores generally have the price "by the yard", but you can get a much smaller amount. I bought 6" of sifferent colors years ago and still have a sh**load of it somewhere. Easy to pick out the verticle threads if you just take about 1/4 inch at a time. Doing it like that you can get a huge quantity of the bright sparkly threads in no time. Oh, I think the prce was about $5 / yard. so see if you can just get 6" of white, yellow, blue and black.

Allan