I see no one has a flamenko lesson so i made one 

flamenko is a great technique to use it will give your bass a higher 
tone 
its basicaly strumming with all four fingers will resting your thumb
a good example is the primus song too many puppies

G———556677——————————————————
D———555555——————————————————
A———————————————————————————
E———————————————————————————
    ^V^V^V

^ — means a downstroke
V — means an upstroke

downstrokes use your finger nails
and the upstroke use the pads of your fingers

useing flamenko strums can give you a sort of guitar sound 
i can be used in any song as ornamentation

useing this technique you caould even play some guitar parts 
of a song
keep practicing