I, too, am a cancer survivor and I didn't have a quilt to lug with me to Chemo -- When you have that IV of chemo running in you, you can get cold. Plus, if you are chewing on ice to reduce the possibility of mouth sores, well, it's COLD.
This is a very thoughtful thing for you to do. Yes, cancer does take control of every area of your life while you are going through and for some years after as you go through all the follow up. But, I'm in the minority, a pink quilt wouldn't have bothered me at all because after I got past the initial shock that I had cancer -- it was reality -- I had cancer and I was dealing with it.
But, the colors probably don't matter that much. It's your act of kindness and care and generosity that will be appreciated more than anything!