Good implementation of lock screen wallpapers?

I know it's early stage but can we all put together a growing list of apps which implements lock screen wallpapers in a great way?

Personally I know of ESPN (Not good), Baconit (Ok) and Facebook (Ok). What other apps you've seen till now which has a great implementation?

Also, MS should have allowed 15 mins refresh times for the lock screen wallpapers. 1 hr is too long for many good ideas.