Here are mine. Sorry, the quality of these pictures aren't top notch. You get the idea, though.

I don't have any guitar specific tattoos but these are all of my music related tattoos that have contributed in one way or another to my guitar playing.
The tree is not quite finished but it starts with a reference to The Strokes (who can only truly be appreciated by guitarists), followed by the Jack of Hearts (a reference to my favorite Bob Dylan song), which ultimately leads up to the Clef heart on my neck (I was a theory major).
Next are the two covers from The Mars Volta's first album, Deloused in the Comatorium(which I got as a gift when I was 12 and ultimately ended up being the reason I became a musician).
Then we have Loulou. He/she is the crossdressing prostitute that decorated the cover of Lou Reed's 1978 bootleg Take No Prisoners.
Following that one is a decidedly liberal take on Orpheus. You can read more about him here.
Coming to a close we have an unfinished Miles Davis tattoo that is part of an unfinished half sleeve dedicated to my Dad, who passed in 2010. This tattoo has a little more significance... My Dad was not a musician himself but he was a lifelong jazz fanatic which he passed on to me at a very young age. When I decided to start taking up guitar he was incredibly supportive when nobody else was. He bought my first "real guitar(s)" (a Fender acoustic starter which I overhauled into one of the prettiest sounding acoustic guitars I've ever played by lowering the action, replacing the tuning machines, sanding off the clearcoat to let the wood breathe, staining the wood, and drilling out the pin holes for brass bridge pins; and years later a candy apple red MIM Strat, which I hot-roded with Texas Special pick-ups and a tortoise shell pick guard). The night he died my younger brother told me a "secret" Dad had been keeping which was to be my birthday present the following year. My Dad had gone out and bought a beautiful Yamaha full size keyboard and started taking lessons. He didn't want to tell me until he felt he was good enough to play with me. Unfortunately that never happened, so I've dedicated everything I have to making sure I am the absolute best musician I can be. If that is truly the case then he never could have gotten good enough to play with me. That way I never have to close that chapter of my life. It's dark motivation, but it's made me a much better guitarist than I ever would have been otherwise.
And finally we have my very first tattoo, which I got on my 18th birthday. I present to you my ode to Beck, "Two turntables and a microphone...".