Eggplant purple makes a nice highlight color for rust. A magneta pink or deep green also looks nice as accent colors. Black or wrought iron accents would look nice. The wrought iron would help bring an element of nature in. When I think of rust and red, I think of terra cotta pots and what looks nice in a terra cotta pot. You want to be sure its not to dark with all the deep colors. Sunflowers. Wood. Bring in as many textures as you can. Fill jars or pretty dishes with sea stone or sand and place candles or a candle collage. Hope this gets your mind spinning with ideas:) Good Luck!