The A minor pentatonic scale is one of the most common scale patterns used by guitarists to build solos and write classic riffs for songs. (image 2)
To finish off your blues you might want to use this classic lick that has been passed down through the decades... (image 3)
The blues shuffle pattern at the top of the post (image 1) is the backbone. That is your foundation. On top of that you can play a solo using the pentatonic scale (image 2) and incorporate your classic blues lick (image 3).