As of October 2015, printable rainbow patterns are on websites for What Mommy Does, First Palette and BigActivities. What Mommy Does offers three sizes of rainbow and clouds templates. The largest prints one on a single sheet, while the others present multiple images on a page.
First Palette has large and small rainbow patterns to download. Both black-and-white and full-color versions are available. BigActivities presents many rainbow patterns in its Nature category. In addition to a plain image, variations include a rainbow with color names, rainbow with clouds and sun, and rainbow with a pot of gold. The site has both landscape and portrait orientations for printing.