In the photo collage below, I searched for images with blue, green and semi-lime colors.....
For this photo collage, I searched for pinks, light reds, blues and purples....
Lil O made a special request for reds, so I searched for images using five shades of reds.
Once you search, you can then click on a photo and it hyperlinks directly to Flickr where you can decide (or not) to download the image (of course, using Creative Commons parameters).
See what you think of TinEye Labs. I have a feeling you are going to smile and be unproductive like me.