You can now narrow results by color in image search! (like in picasa):
Example:
images.google.com/images?imgco ...
images.google.com/images?imgco ...

(seen at twitter)

Cool! All of these additions and filters are making Google Images an amazing search companion.

Well.. it's not always that good.. :/
images.google.com/images?imgco ...

I think it did fairly well, all the pics with Red in them DID have lots of blue also...

David
You think thats bad.... :P
images.google.com/images?imgco ...

As James said, there is a lot of that colour in the picture.

I was going to say "It looks for the colour theres the most of, it can't tell what the picture is of", but then I realised theres the face search, so maybe they could look for the shape of a car and tell what colour it is :/

lol Martin.. :P

In my article for Zorgloob, I've displayed this example

"hulk" in green

zorgloob.com/images2/hulk_gree ...

zorgloob.com/images2/hulk_red. ...

zorgloob.com/images2/hulk_yell ...

Eh..
Nice Tom! :)

Zim:
Where did you see this on Twitter? When I posted about the feature, no other page mentioned it.

Good job uncovering this Ionut.

Wonder what else could be done in terms of image search types and restrictions?

Ionut: The source of the tweet turned out to be Matt Cutts [1], who retwited or read it at @googleos. I didn't noticed this, sorry!

[1] twitter.com/mattcutts/statuses ...