Watch the F7 Blues 2 String Arpeggios online guitar lesson by Rob Garland from Melodic Soloing: Blues Chord Tones

A useful device is taking an arpeggio and putting it over 2 strings, then connecting chord tones with slides, slurs, bends, and passing notes to make musical sounding phrases. This works great in a blues context, especially on a fast shuffle such as the F7 jam.