I had a lot of reds and someone said all reds work together. So I put it to the test. I made a bargello heart using only red fabric. It worked and turned out beautiful. All the reds blended quite well.
I also did Bonnie Hunters Pineapple Blossom using my Christmas fabric as scrappy. The only thing that was consistent was the white background. Again it worked well. So just go for it. Marge