This is a thread that probably won't go any where but I must try.
I want to share some of my improv ideas in the hope that someone will read it and get a new spin on things, then reply with their spin.
Say you are blowing over A in a blues context.
So I might use some Am Pent/Blues Scale stuff over the I chord.
On the IV chord I might use the Am Pent with a lowered 7th ( Major Sixth) it out lines the D9 chord nicely.
Over the V chord I would likely use E7sus4 or what I call the Hindu Pentatonic (Eminor Pentatonic with a major third instead of the minor third).
Now if this was more of a Jazz Blues Context over a Am7 Vamp.
I would start out with A Dorian Minor (5th pos) then A minor Pentatonic then using the Blue note (b5) as a pivot tone, I would move into B Phrygian Dominant (7th pos) , Back though the Blue Note (Eb) to Am Pent (5th pos) then to A Aeolian (5th pos) then to A harmonic (5th pos) then add the Natural 7th for the minor Bebop scale (this is usually at 9th pos), from here you can migrate to D Dorian (10th pos) ( if the chord change goes to the IV [like in a blues prog] you can star all over up a forth).
I think if someone actually tries this they will be pleased with the results.