Green is the color of Wazapp and Whatsapp. I see nothing wrong with green.
Mixing green and default blue is really not nice... How about we add some red to it?
Bubble color should be kept separate IMHO as there will be some updates about it too.
It think it's funny how some ask back for uncropped backgrounds and then the very same complain about high battery usage, app slowing down and similar.
What did you expect when you load a 8Mpx photo as background?
Backgrounds must be cropped and cropping algorithm will improve over time. You have no idea how tricky and messed up it is to code it.
So please, think twice what you want.

I'm also using Coderus last build until TGalal merges the changes into dev branch.
It's very stable, smooth and I like it a lot.