I like medallions on a commercial pistol too. The industry standard double-diamond grips are so ho-hum in my opinion. Back in the 1980's a set of exotic wood grips was something to catch your eye, but nowadays there's just too many of 'em out there.
All of my guns that have Colt slides and frames have medallion grips. I prefer fully-checkered, but do have double diamonds on a couple. Colt has made quite a few different medallions over the years, and I try to have the proper "flavor" for each gun. I think the bright gold ones look best on polished blue, bright silver medallions on polished stainless or chromed guns, etc. I have some older, subdued silver and brass-look medallions that would look better on something less flashy, like a Gunsite. I chose a set of those older, silver ones for my stainless '91A1, with deep burgundy-colored grips.