https://github.com/syohex/emacs-zoom-window.git
git clone 'git://github.com/syohex/emacs-zoom-window.git'
zoom-window provides window zoom like tmux zoom and unzoom.

Background color of mode-line is changed when zoomed
zoom-window.el supports elscreen. You can zoom window per tab.
zoom-windowToggle between zooming current window and unzooming
zoom-window-mode-line-color(Default is "green")Color of mode-line when zoom-window is enabled
zoom-window-use-elscreen(Default is nil)Set non-nil if you use elscreen
(require 'zoom-window)
(global-set-key (kbd "C-x C-z") 'zoom-window-zoom)
(setq zoom-window-mode-line-color "DarkGreen")
(require 'elscreen)
(elscreen-start)
(require 'zoom-window)
(setq zoom-window-use-elscreen t)
(zoom-window-setup)
(global-set-key (kbd "C-x C-z") 'zoom-window-zoom)