I have attached PDF of an exercise arrangement that I have conjured up.
The bass line was taught to me years ago on bass by my advisor/ instructor George Lopez of Los Angeles' Musicians' Institute. I have always like this line so I have adapted it here for Stick (baritone melody / standard bass). George said it was a good "all purpose" 12-bar line you could whip out whenever you needed something that sounded both bluesy and jazzy. I always liked the chromatic runs and the fact that once you got this under your belt and could play it at speed, it made you sound like a hotter player than you actually might be.
George challenged us to come up with as many turnaround variations as we could for the last 2 bars....I've transcribed my fave....it's nothing fancy, but gets you back to the top in a walking bass jazz style.
I generated this in part as an exercise to get my left hand to move instead of it being frozen in one spot. (Greg H. probably remembers how constipated my left hand was from the 2004 seminar....). I have tried to transcribe the finger choices here for smooth movement and good power. You will have to use your pinky, though.
Now while George wrote the bass line, I have generated the chords to go over the top. These are rootless diatonic 7th chords all played on the middle three strings if you're on a ten string instrument. I made these diatonic, but if you want an even bluesier sound, you can try substituting dominant 7th chords for some of the major 7th chords (or others) if you like.
I will admit, I approached this as an "academic" exercise so the right-hand chords leave a lot to be desired in terms of voice leading etc. and may sound wretched. Some, like the D7 / V chord at frets 8, 10, 12 are knuckle-busters. Also, if you play this literally as written (especially in the right hand), it is likely to sound pretty dry and stiff. Feel free to experiment with different chord voicings and with different rhythmic feels, syncopations, etc.
Hope you enjoy and don't find too many errors in my work. Try not to point and laugh.
Update: Scroll down and I have posted a more correct version in PDF and JPEG format. The PDF was sort of large (930 KB) and was likely causing some folks download issues due to size or other PDF / Adobe compatibility problems.