None of the things you suggested would be ok for making a kit to sell, Els. If, however, the greeting cards are vintage (no longer under copyright protection) and the doll is an antique (over 100 years old), then that would work. All the popular dolls and toys made by companies today are heavily protected by copyright laws, and they will pursue legal action against anyone infringing on those rights. Never consider using Disney images in any kits, for example, as they are very aggressive in going after people using those images for commercial gain. I'm sure Mattel is similarly-minded on this issue.
Of course you can put anything in your personal scrap layouts or kits you use for your own personal pages. But not commercial or scrap for hire.