This is small collection of i3blocks that I use.
The following is an example i3blocks.conf file.
separator=true
separator_block_width=15
[cpu_usage]
command=cpu_usage
markup=pango
interval=persist
REFRESH_TIME=1
[memory]
command=mem_usage
markup=pango
interval=persist
[bandwidth]
command=bandwidth
interval=persist
markup=pango
[pomodoro]
command=pomodoro
interval=persist
format=json
markup=pango
[time]
command=date '+%d-%m-%Y %H:%M:%S'
interval=1