The original pin:
This was very simple to make.
1. Select tissue paper colors. Cut to desired length and cut enough to span the width you'd like to cover.
2. Make some white tissue paper poms.
(see tutorial here) http://icingdesignsonline.blogspot.com/2013/02/happy-diy-rainbow-tassel-and-paper-pom.html?m=1
3. Tape crepe paper to wall or surface you are using. Tape tissue-pom clouds to cover top edge of crepe paper rainbow.
4. Stand back and admire what you've created!