For So What I do it very simple, a kind of phrase each four bars.
Or the same thing on three bars, on the fourth bar I change something :
D E F E / D E F E / D E F E / D D A C
D D A A / D D A A / D D A A / D E F E
D E F G / A G F E / D D A A / D A C C#
D E F E / D A C C# / D E F G / A G F E
Eb F Gb Ab / Bb Ab Gb F / Eb F Gb Ab / Bb Ab Gb F
Eb Eb Bb Bb / Eb Db Bb D / Eb Db Bb D / Eb Db C A
D D A C / D D A C / D D A C / D E F E
D D A A / D D A A / D D A A / D F G A
That's just an example but that's the way I play it.
Or the same thing on three bars, on the fourth bar I change something :
D E F E / D E F E / D E F E / D D A C
D D A A / D D A A / D D A A / D E F E
D E F G / A G F E / D D A A / D A C C#
D E F E / D A C C# / D E F G / A G F E
Eb F Gb Ab / Bb Ab Gb F / Eb F Gb Ab / Bb Ab Gb F
Eb Eb Bb Bb / Eb Db Bb D / Eb Db Bb D / Eb Db C A
D D A C / D D A C / D D A C / D E F E
D D A A / D D A A / D D A A / D F G A
That's just an example but that's the way I play it.