Guitarhacker
Blues... examples.....
so many....
You have the old masters from the early years,..... just depends how far back you wanna go. Then you have the white boys who were inspired by the masters..... most all the rock bands of the 60's were in this category. Then you have the modern blues players.... still changing it up and still making it fresh today. We have a few really good blues men here in the forums too.... To get a starting point on inspiration..... hit YouTube and type in the search "Blues" and go from there....
don't forget the minor chords when working the 1,4,5....
as far as structure..... man, whatever works,,,, verse chorus and bridges are all fair game and in whatever order the song tells you it wants to have them played....
Blues are about emotion..... so let the song tell you what it wants. Feel it, and let it be what it needs to be.... That might sound like a "Zen thing" but it is what it is when it comes to the blues.
There are no rules..... just feelings and emotion.
And Dom7s see frequently use and there's the ii-V and ii-V-I. I'll see if I can find a YT video about the variations on the usual progression. Other genres you should study are: Jazz/Gospel(Hymns)/Rock 'n' Roll/Country - all utilizing the ii-V-I. Other if not most genres employ it, but those are where that progression is found very often.
Video:
http://www.youtube.com/watch?v=3VWUFpLKOFE And there's also the appropriate Blues scales when improvising/soloing (Pentatonic is the most used which comes in three flavors - Major, Minor and Neutral)
Borrowed chords work (which you alluded to), but the ii (m7/m7b5) iii and vi and vii (m7b5) also see play time.
And the feeling thing, that's not just blues, but every other genre. What does this song need? You'll figure that out as you write it. I've said this before, but music is her own being. She'll tell you what she wants and needs. From form, progression, dynamics/articulations, scales/modes, etc, etc.
You'll have disagreements as this is an ear thing, but you'll work things out.
What you hear evokes thought and thoughts provoke feeling. Feeling is not and can't/shouldn't be seen in isolation.