Hey looking 4 some good fairly easy blues guitar riffs for a two-piece guitar band or even just for a solo preferably in A or E but fine in other keys thanks
The basic blues measures?

Lots of Led Zepplin songs have solo-over-able riffs, or just Voodoo Child it up.
Look into

Muddy Waters
T-Bone Walker
The Yardbirds
Buddy guy
Basically any music before 1975 that wasn't pop or jazz

Learn Texas Flood, His Version of Little Wing, Pride and Joy, and Rude mood, You'll have enough riff's. I guarantee it.