Here's yet another cool device I found on the "Nanny McPhee" soundtrack by James Newton Howard. Here are the specific things I wanted to emulate:
1) The combination of Clarinet/English Horn/Bassoon and Alto Flute on the main melody. Really liked that sound.
2) The way the second violins foreshadow the modulation.
3) The pedal/ostinato in the woodwinds in the second part of the device.
I didn't use a sketch for this one since I already had a very clear picture of what I wanted. I still treated the full score like a sketch though by focusing on the main thing (usually the melody) first. By doing that you make sure not to overwrite, since everything besides the main thing is there to support it, and has to be arranged accordingly.