Ever since the final release of Windows 7 back in 2009, Microsoft has been continuously updating the personalization gallery with new themes. We have covered many awesome themes here on this blog. Rainbow theme is yet another new theme for Windows 7. The theme feature some awesome wallpapers based on rainbows and in all there 18 high resolution images. This theme brings the fleeting magic of rainbows to your desktop and enjoy shimmering hues and otherworldly arrays of color poised over stunning landscapes from around the world.