Cut a long piece of yarn, again as long as you want it wide.
Tape the streamer on to the yarn by folding it over and taping it.
The pattern I used was two pink, white, two pink, white, hot pink (repeat).
Then I would suggest making a separate strip so that you have two layers. It's the same process, exempt for the back layer I used a different pattern. I just did white, pink, white, pink, hot pink.
The really great thing about this photo booth is that you can use ANY color pattern. You can even add pops of glitter streamers (and such). Its a really fun, simple, and cheap way to add to any party. Definitely saving this for another party.