Liane, I don't think they're Roseville - the colors don't relate to what was produced in the Raymor line (at least per my references.) I also thought that these could be something produced on Franciscan's 'eclipse' shape, but those items were always marked. The colors you report seem to be the 1970s 'decorator colors' (when pumpkin/orange, rust and tan were high-fashion.) Not sure about that 'muddy blue', though.
Anyone else?