I think with a bit of tweaking, you could probably adapt this method to work for Photoshop.
I've never used CS2, only CS5, so I don't know how advanced the CS2 is compared to CS5 and GIMP. Try searching for a coloring tutorial in the Resources and Stock Images gallery, or check out some of the tutorial groups here in deviantART such as #
TutorialsClub or #
ArtistsHospital. Perhaps someone there might know how to help you!