Ruben posted a thread at Google Blogoscoped Forums with a screen shot showing how Google is testing slightly different variations of colors in the web search results.
Most of us wouldn't take notice to these changes but Google is obviously testing the slightly different color changes to see if they have an impact on the searcher. By impact, they are likely testing to see how users interact more or less with the search results based on the color changes.
Here is a picture from Ruben:

Do you think the slight color changes can make such an impact? I bet Google has data to prove it does.
Forum discussion at Google Blogoscoped Forums.

Comments:
Seo Consultant London
11/07/2011 01:46 pm
Wow Nice..
PIGS
11/07/2011 02:10 pm
"I bet Google has data to prove it does" increase their earnings more and sends even less clicks to us. It's sad, we need to promote an alternative not a bunch of greedy googler b@stards. They are pigs.
Guestguy
11/07/2011 02:10 pm
Slow news day?
Barry Schwartz
11/07/2011 02:12 pm
Not really guest guy - i found this an interesting test.
Cameron Beyer
11/07/2011 02:15 pm
I prefer the colors that they're using "now." [The shade of green that the URL below the snippets is] is really distracting in my opinion if it's too bright or too dark.
John Sutherland
11/07/2011 02:22 pm
I'm colorblind, so this has no effect on me. Colors?.....What colors?
nenglish
11/07/2011 04:07 pm
Seriously, that can't make such a massive difference? It took me about a minute to even figure out if there was a colour change!
Tad Miller
11/07/2011 04:52 pm
In the last 3 weeks I've seen no color shading on the ads on Chrome when I'm at work. Seems very deceptive.
Fedor
11/07/2011 08:36 pm
That light blue color will strain your eyes after searching for a while. Bad idea.