Remember that neat Twitter client from earlier today called Talon? Well, the developers have also released a new SMS app called EvolveSMS with a lot of the same UI flair. EvolveSMS takes advantage of translucent system elements on KitKat and borrows some extra pieces from Google's design language to create something very cool.
Klinker Apps previously created a popular SMS client known as Sliding Messaging. EvolveSMS is essentially a spruced up version of that app with improved features.