The classic twelve bar blues also has a classic poetic pattern:

(B7) . . Well, it's good (E)morning, blues. (A7)Blues, how do you (E)do?. . . (E7)
I said good (A7)morning, blues. (A7)Blues, how do you (E)do? . . .(E) .
Well, I'm (B7)doin' all right, son; good (A7)morning, how about (E) you?. . .(B7) . . .

Notice the use of the IV7 chord instead of the IV chord--common to a lot of blues.

Another common type of turnaround (the last two bars) might be /E E7 A Am /E . B7 . /

The use of a rhythm based on thirds (12 to the bar, three to a beat) is also commonly used:

/one and uh two and uh three and uh four and uh/

--seed