This is a more unusual colour scheme but it works well. Here, greyed plum tones are offset with some burnt orange. The greys with green undertones add a bit of spice and balance out the striking purples and orange. Note there is a slightly brighter version of a purple and orange to be used as highlights. This is a great colour scheme to add depth to any quilt and the dark brown will blend the strong colours together.
I would use the oranges as highlights and let the other colours do the main work. Use different values of each colour to let the colour scheme shine.