Last year I did several mystery quilt alongs with LQS and used mostly fabric in my stash and found when final clue was given I usually liked my quilt better than pattern picture just because I was using fabric/colors I loved.

I've never really thought about it but you're probably right! I try to only use fabrics I really love because quilting is a big task (labor of love of course).

And in the other sense .... colours/fabrics choices can turn you off a quilt pattern.
Or at least, it happens to me!

A few years ago, I won a quilt pattern.
Nope, not interested. Never will make that one.
Then one day I was in the store I won it from and ... gosh, that's a beautiful quilt.
Flashback .... it was "the" hated pattern! :)

I just pull out fabric colors I like and make 7-1/2" blocks for my donation quilts. I try to use at least three colors. Some times I add borders.

Yes, the colors seem to catch my eye before the pattern. Sometimes after I look at the pattern I decide I'm really not fond of the pattern but the color scheme.

When I look at a pattern, it is the pattern possibilities that attract me, rather than the color scheme. It's fun to match a pattern to stash fabrics that I imagine would look good in that pattern.