For one of the classes I took, I used a jelly roll of batiks [really liked the colors]. I was working away madly when I realized that I would not have enough fabric to complete the top. My instructor reached into her grab bag and found me a stack of fabric with colors which would blend with those I had. They were not batiks, but they went together so well I combined the two different fabric groups. The ladies in the class were amazed with what I had created. That quilt went to a friend who is getting married next week. She cried tears of happiness when she opened the package it was in. She certainly didn't notice that I had combined fabric.
It's your quilt: do what makes you happy.
Bill