Here's a pretty simple blues bass riff,
it sounds pretty good.

Artist        Anyone

Part 1(x4)

G | -------------------------|
D | ----------44-77-44-------|
A | ----44-77----------77-44-|
E | -55----------------------|

Part 2(x2)

G | ----------44-77-44-------|
D | ----44-77----------77-44-|
A | -55----------------------|
E | -------------------------|

Part 1(x2)

Part 3(x1)


G | ----------66-99-66-------|
D | ----66-99----------99-66-|
A | -77----------------------|
E | -------------------------|

Part 2(x1)

Part 1(x1)