Hey,
I'm sure many of you have heard of David Sprunger. He is an online blues piano teacher and owns his own site with some great blues riffs on it. Check it out:
www.playpianotoday.com
At the beginning of his videos there is always a piano intro and in this intro is this set of riffs. I have "sort of" worked it out and here is my rendition of the riffs in that intro.
*Edit* Sorry for the poor camera angle and nervous speaking; I wasn't very experienced back then!
Hope this video helps :)
Ben