Challenge: Bach -> Bach

The goal of this challenge is to write a prelude i the following manner:

Take any two of the Bach's 48 preludes from The Well - Tempered Klavier and put them into one, new prelude in such a way that figuration, melodies and form is taken from one prelude and harmonic background from the other. A clear example of what i mean is this:

http://www.youngcomposers.com/music/3701/j-s-bach-c-prelude-bwv-848-in-c-prelude-bwv-846/

where i took 848's form and figuration and 846's harmony and quasi - melody (the highest note in arpeggios) and made a new prelude. You can hear both preludes inside this one.

The key you are writing in must be of the either prelude (but not of neither).

That's the challenge.

The deadline is 16 December 2012

Good luck!