Have you tuned in to the Rainbow Tape Blog yet? If not you can find all the postings from the Design Team HERE! The Black Rainbow Tape just stays out on my desk, because its such an easy add on to almost any card.
Today I've used it on the inside panel of my card with the clouds. I just added a strip of 1/8" Black Tape. I die cut the white frame, added my clouds to the inside panel and then the black edge and then put it back in place. Much easier than measuring and adding an additional layer of card stock!