I created this very basic addon, the base of few scripts and help from some friends in the intention of colorizing both the frame life bar (player / target / focus) and the background of both. So much searching the internet in forums, addons already made and others I decided to post here, because I imagine that like me many people want this function and can not produce or find it.
My thanks to Sylen (www.twitch.tv/sylen_) and his friend @wlfzx.