We've all seen Alex Ross draw his version of the Grell-era Legion of Super-Heroes on more than one occasion.
Ross did an homage to Grell's cover for Limited Collector's Edition C-49 as the cover to Back Issue magazine 61, which can be seen earlier in this thread, but here are smaller versions for your convenience.
Ross also did a Legion picture of his own creation, a version of which was posted earlier, but here's a bigger version below. However, did you know that Mike Grell returned the favor and did an homage to Alex Ross's homage to him? Below Ross's pic is the Grell pencils for his version that's rarely been seen. Pretty cool -- a reciprocal homage cycle!