Make display in yosemite / el capitan look like Mavericks
I though initially you meant you wanted the old skeuomorphic UI back… but you just mean that the display has changed or lost its colour profile. There should be no automatic change in your colour settings between Mavericks &amp; Yosemite or El Capitan, so the first thing I'd check is whether your correct profile is still present &amp; active.

Check the profile exists &amp; is active in System Prefs > Displays > Color

If not, or if you can't quickly find one that suits you, then hit the Calibrate… button &amp; attempt to recalibrate manually. It will talk you through the process quite comprehensively, but it isn't a hugely accurate process - sometimes going through it a couple of times you get a better result.

More accurate calibration, of course, would require a hardware colorimeter, which would probably be a different question. I put a couple of budget recommendations at the end of this answer - https://apple.stackexchange.com/a/185936/85275