Tmux status that draws a rabbit if your cpu is not in heavy use, or a turtle if it is

.tmux.conf

set status-right "#(cpu.rb)"
set status-interval 5

cpu.rb

#!/usr/bin/env ruby
# encoding: UTF-8

usage = `echo $(top -l 1 | grep "CPU usage:")`
idle =  Float(usage.scan(/(\d+\.\d+)\% idle/)[0][0])
if idle < 20
  print " 🐢 "
else
  print " 🐇 "
end