The dying of the quilt top is a good idea (not necessarily tie-dying). In a quilting book I have "Great American Quilts 1989" publ. Oxmoor House, is a quilt like this. The maker hated it. She cut it into large pieces in a chevron-type pattern and put it back together with a white strip joining the pieces. Then she dyed the whole thing a deep fuschia. It turned out beautifully!
If you decide you don't want to use anymore time trying to make it suit you better, donate it to a charity and write the donation off on your taxes.