Over the last week or so Google appear to be rolling out a test on the SERP on a small number of users. At iProspect our team have seen black hyperlinks (instead of blue) and green ad tags (in place of orange).
Personally, I only saw this happen on Safari iOS while signed in – Chrome iOS did not show the black links even when signed in.
This showed up on paid and organic listings and has made it very difficult to decipher the difference between ad copy, structured snippet and callout extensions.
Other users are experiencing a much brighter blue hyperlink and the orange tag is also being tested in a green similar to that of the display URL (see below)
At the time of writing this looks to be only a test on a small pool of subjects. However, it will be interesting to see if the test is rolled out further, and if so, which of the elements will be kept.