Turn on ido-completion for org-mode.
Change default window layout for ediff from stacked to side-by-side.
Start using hideshow-org; get rid of custom key bindings for standard
Hide/Show commands.
Change default theme from wombat to base16-default.
When changing the theme interactively, disable custom theme(s) before
loading new themes (to make sure theme looks exactly like it would if it
had been loaded at startup).

Source: https://github.com/larstvei/dot-emacs
Define some tweaks for base16-default, tronesque, and wombat themes and
make sure they get applied after loading these themes by advising
load-theme.
Change the maximum number of newlines allowed in an org-mode emphasis
expression.