Watch the Shuffle E online guitar lesson by Jeff McErlain from Essentials: Advanced Blues Rhythm
Here's a classic shuffle in E with a few cool variations. This basic boogie-woogie style shuffle is quite common, and as a result I don't think it gets as much effort and time spent with it as it deserves. I'm speaking from personal experience, as it's the first thing you learn how to play when getting into the blues. So, we tend to take it for granted that we can play it well, and I'm living proof that that's not usually the case!
There's a large degree of hubris that can take us over when playing this genre, and as Buddy Guy said, "Blues is easy music but difficult to play." I know I sound like a PSA, but don't do what I did!