Thats a difficult question to answer Dave.
What decals do you have available to use for a start?
Is it that you want to avoid doing zimmerit on your model so you don't want to use the kit decals as per the box art?
There are two other sets of decals in that kit for Tiger 312 and 334 or the Pz Abt 501. Neither machine had zimmerit.
You could check out the photos over on TIIF web site but they are just B/W photos.
I can't think of any other web site with King Tiger colour profiles and i can't off the top of my head think of any cheap books on the subject. There are colour profile books that are just general profiles of mixed vehicles that may include the king Tiger but you don't want to buy a book for a couple of pages of useful material.
Regarding King Tiger camouflage once they stopped getting zimmerit in september 44 they began to have camouflage patterns painted in the factory so all of the later ones have a standard pattern.
Take a look at my Blog chapter over on Tracklink covering paint patterns on KTs.
You could also take a look at some of the builds on this site in the Gallery.