Google seems to be testing a different shade of green for the URLs listed in the search results, the snippets. Ronnie Jones shared a screen shot with me on Twitter of a side by side, showing the slight subtle difference in the color.
Here it is:
Personally, I find it almost impossible to see the difference, but I am horrible with these UI changes and seeing slight differences. I actually post a ton of Google user interface changes here, so catch up on them there.
Ronnie said "Google seem to be experimenting with a new shade of green in the SERPS." If you say so. :)
Forum discussion at Twitter.
This post was scheduled to go live today but was written earlier - I am currently offline today.