Wouldn't That be cool?

Graffiti // Wednesday, April 03, 2013
A Photoshop illusion, but an interesting look that would certainly grab ones attention.

Homemade Rainbows by Michael Jones McKean

Juxtapoz // Saturday, May 12, 2012
Coined by Hyperallergic as "instant happiness", artist Michael Jones McKean's project The Rainbow: Principles of Light and Shapes Between Forms has achieved the phenomenological triumph of creating manmade colorful arcs in the sky.

"Your Rainbow Panorama" by Olafur Eliasson

Street Art // Monday, March 12, 2012
Choose what hue or tint you would like to view the world in.  The rooftop at the Aros Museum in Aarthus, Denmark permanently hosts this circular rainbow walkway designed by Olafur Elliasson.  At night, the installation is lit up from inside by spotlights embedded in the floor.