I made these for all the Rolling in the Deep dancers with the song lyrics and they were so great! It's hard to find the blue glue but the clear Elmer's gel works just fine. I would add a couple drops of food coloring just so you can see it on the shirt. I would also not recommend trying to do 7 in one night...just saying.
DIY Proenza-Schouler S/S 10: Turquoise Two-Tone Button-Down Shirt & Horizontal Stripe Shirt with Raglan Detail