Here is an Orff Arrangement of the 12 bar blues in C Major. You can use this with the 12 Bar Blues Songwriting Worksheet that is color coded for boomwackers to accompany your students' original blues compositions.
For the drum part, I used buckets and duct taped tambourines to the top to mimic a high hat sound. :)
Your students will love how cool they will sound playing the blues. For some extra fun, play along with Elvis' recording of "Hound Dog." It is in C Major 12 bar blues form!