PIL - Pixel Level Image Manipulation?

[Gregory Piñero]

I want to be able to randomly change pixels in an image and view the
results.  I can use whatever format of image makes this easiest, e.g.,
gray scale, bit tonal, etc.

Ideally I'd like to keep the pixels in an intermediate format like a
list of (integers?) or an array and convert that to an image as
needed.

I'm hoping someone has some experience on this and could offer some
advice or code.  I thought it would be easy in PIL  but I'm not sure.

Much Appreciated,

-- 
Gregory Piñero
Chief Innovation Officer
Blended Technologies
(www.blendedtechnologies.com)