Bumblebee status
Have you ever needed to know if your hybrid (Optimus) laptop is currently running Intel or Nvidia graphics? In GNOME there was an extension for that. Out of boredom I took a look at its code, which resulted in this short script. It simply reads the /proc/acpi/bbswitch file and displays appropriate icon. Of course you need Bumblebee installed.
~/tint2-executors/bbswitch-status.sh
#-------------------------------------
# Executor 4
execp = new
execp_command = ~/tint2-executors/bbswitch-status.sh
execp_interval = 2
execp_has_icon = 1
execp_cache_icon = 1
execp_continuous = 0
execp_markup = 0
execp_tooltip =
execp_lclick_command =
execp_rclick_command =
execp_mclick_command =
execp_uwheel_command =
execp_dwheel_command =
execp_font_color = #ffffff 100
execp_padding = 0 0
execp_background_id = 0
execp_centered = 1
execp_icon_w = 30
execp_icon_h = 30