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Basic Blues Shuffle
As shown in this example, once you've got your basic shuffle down, you can spice it up by playing a bit faster and inserting little riffs at the end of each bar (or wherever they fit, depending on the lyric line). If you want more ideas for turnarounds in measures 11 and 12, there are already a couple of blues turnaround lessons on wholenote.
Note that all of the riffs here are straight from the E blues scale, although they do depend pretty heavily on pulls, bends and slides, which are essential for the blues. If you learn the blues scale (and you better if you want to play blues!), it becomes pretty easy to improvise more of these little fills -- anything from the blues scale sounds OK when you play it over your basic blues shuffle.