12 bar blues
this is the base for about more than infinty songs with a few variations.

G---------7-7-9-9----------------------------------------------7-7-9-9-------
D-----9-9----------times four----------5-5-7-7--twice------9-9----------twice
A-7-7------------------------------7-7-----------------7-7-----------------
E------------------------------5-5-------------------------------------

G----------------------------------------------------------------------
D---------7-7-9-9----------5-5-7-7--------------------------------------------
A-----9-9---once-------7-7--once-----------------------4-4-5-5-6-6----------------------
E-7-7--------------5-5-------------0-0-4-4-5-5-6-6-7-7------------------------------
                                   ^really cool run down
the reason i like the run down is when you start again it sounds like part of the run down.

Try some varitations using the notes such as
G---------7-7-9-7--
D-----9-9---------9
A-7-7--------------
E------------------

Just have fun with this like every other musican has.