I found the seperate RGB FITS files for this image of M82 here.
Beware! they are rather large files, 589MB each, so you'll need a fairly fast internet connection.
I converted the FITS files in CS4 using the FITS Liberator plugin for Photoshop provided by ESA, and then reduced their size, they're huge!
I then copied them into an RGB file and just tweaked a few settings like 'shadows and highlights' and levels to bring out the details.
Here's my feeble attempt using my equipment.
