First of all - not true. Second of all, MS developed the cars from lowly beginnings to his needs so that he could win the championship - that's a remarkable feat in itself.
I thought Ferrari developed car for him. With a team of great engineers and loads of money. But I can imagine MS doing his car in a do-it-yourself manner over the years. I really do

Honestly, I don't think that was such a great achievement from his side. When you think of it, it took much less time to Mika to develop McLaren to suit his needs... (or, more recently, FA to develop Renault). Unfortunately Mercedes engine turned dog after regulation changes (that, intentionally or not, did play in advantage for Ferrari) and technical excellence of Ferrari packages did let MS remain on top for so long... but I don't really think that was MS's exclusive, he was just lucky to be good driver in great car.
You can have it in any colour - as long as it's black. Or red. Or blue. Or green. Or white. Or navy blue. Or...