I believe what you're describing is
déjà vu.
I'm not too sure I'm convinced by what you're saying blue rose, it sounds like a simple case of "if youre looking for something, you'll find it".
Ordinarily you would discard a blue feather, but if you're thinking about finding a blue feather and you do find one, you'll be all "I found this blue feather because I was thinking about a blue feather".
BUT I do agree that having a positive outlook creates good luck and good outcomes, through motivating people around you to have the same positive outlook and thus giving you "good luck" by being kind.
It's a very interesting topic and I think the mind is very good at creating patterns out of nothing, which is why so many beliefs in horoscopes and tarot are out there (plus these practices have had many hundreds of years practice of casting as wide a net as possible).
I'm certainly a skeptic, but I do believe that many of these practices have hidden merits.