I find this set an uncommonly diverse selection of logo handling yet they all have a good bit of restraint to them that really takes them the distance. It’s also nice to see a movement away from the past few years’ Web 2.0 look.
There are times where you really should mess with things. Most times, you should never mess with your brand, especially when you’ve got so much invested into it, like Holiday Inn did. When your look becomes an icon you shouldn’t change it, you should build on it. This is elegantly eluded to by Fast Company