To neutralize your home does not mean that everything needs to be beige, empty,and sterile. Not real inviting. There are so many colors that are appealing and will work with most peoples decor. To warm up a dark space try using colors like , ambers, golds, and creams. Or for a little more dimension grey, olive, or slate blue, these colors look awesome teamed with white trim. If you look at the paint swatches at your local home improvement store , the color goes from the darkest saturation and gradually changes to the lightest tint.
Stay away from bold statements like red or orange, try rust or persimmon. Keep your sofa neutral, and add texture. By some new throw pillows in bold geometric shapes. Clean off those "catch all" coffee tables and place a few vintage books and a bouquet of fresh seasonal flowers. Its that easy.