For my card I have used very subtle lines of Rainbow Tape in white for the background.
A Splash of watercolor in pink was put down first. Diagonal lines of Rainbow Tape were next. Using a stencil, Texture paste was smoothed on over the tape. After letting the paste dry, I added more tape.
The Hope and Ribbon die cuts are from Serendipity.
You can go here to see all the colors and sizes of Rainbow Tape!
Thanks for looking!