Hi! Jeanne here today with a card using Rainbow Tape for borders.
I made a watercolored background with Color Burst from Ken Oliver Crafts. I used both purple 1/2" Rainbow Tape and 1/8" black Rainbow Tape on the bottom edge of my die cut (from Impression Obsession). I created a frame for my watercolor/die cut panel using 1/8" black Rainbow Tape before attaching it to my black card back.
Have a great day!