You can start them off on some basic patterns, like:
a) octaves (L-shape : I-V-I(octave) ).
And incorporate that in a song or a simple tune, like a salsa groove.
b) major/minor pattern.
Just groove on that. It's fun and simple. You can do a simple 4/4 beat.
e.g.: I - III-III - IV - V.
All bass player LOVE to groove !! So incorporate basic patterns and lil tricks into a simple groove, and they'll appreciate you for it !!
