Perhaps you could quilt it with a dark pink, or maroon colored thread? That would make the lighter colors of the quilt "pop" more.
I had a Double Irish Chain quilt that looked nice, but was a little on the bland side. I asked my LAQ what to do, and that was her suggestion. She used a dark green thread, and when it was finished, it really added to the overall look of the quilt, and I loved it. Since you don't really want to rework your whole quilt, this suggestion might work for you, too.