Watch the Running Shoes Blues online guitar lesson by Ton van Bergeijk from Fingerstyle Blues & Boogie Guidebook
This is a pattern that you can use for a ton of blues songs. We're talking two finger strumming here, alternated by the odd fill with whatever fingers are needed. The thumb plays dirty on the bass strings; the index plays dirty on the trebles. In my mind, it's grooving in a Big Bill Broonzy type of way.