So, I have some nice tips for your .bashrc, with screenshots. Also a handy command to show your biggest packages in pacman/arch.

Simple Calendar with today marked as ##
tcal

Fast cd up:

Network Info (LAN IP, IP and MAC):
netinf

Biggest folders in directory Gigabyte version:
dug
Biggest folders in directory Megabyte version:
dum
Process Grep:
pg
Nice greeting when opening a bash shell:
welcome
(put this one at the end of your .bashrc file)

And the huge packages finder:
dup
(I've put this in /usr/bin/dup and chmodded it to 755).

Thanks to the arch forum for most of these tips!