Digital Coverup has been successfully used to change eye color, tone down the highlight on a bald spot, and change the color of a blanket from pink to blue. Need to make your grass greener?
Clicking on the thumbnail above will open a larger image. Clicking on the larger image will toggle between before and after.
You can take a look at the instructions in a separate window.
The filter can be found under the Effects/Video Filters/Sheffield Softworks/ menu.