Blues Form on Bass w/Walking Bass Line

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Blues form with a basic walking pattern. I had a request to add some tabs, so here they are (I can't seem to get the tabs to line up properly once I save the description; sorry about that...I hope it helps!):
Riff over the I Chord:
|--------|--------|
|----0-2-|3-2-0---|
|--2-----|------2-|
|3-------|--------|
Riff over the IV is the same, but start on the A String.
Riff over the V Chord:
|------4-|
|--4-7---|
|5-------|
|--------|
The IV riff at the end uses the above pattern, but starts on 3rd fret.
Here's the Form:
| I | I | I | I |
|IV |IV | I | I |
| V |IV | I | I |
(orV)