Here are six more riffs in A starting on the fifth fret of the 6th string. These, and the previous riffs can be played in any key as long as you start with the root note on the 5th or 6th string. For example, if these riffs were played starting on the eighth fret of the 6th string, they would be played in the key of C. Practice playing these riffs against Blues progressions in various keys, for example the key of G major or E major.
Use down picks (a) for the quarter notes and alternate picking (as) for the eighth notes.