I'm currently discuss to finalise the drawing for a granny flat in Logan. I wonder what is the best colour combination for the roof and the external walls? The exiting house is the old brick house. Should I match the colour with this one? - Roof will be Colorbond. ( thinking ... like dark blue-gray ... ) - Walls will be James Hardie, primeline external cladding boards. ( thinking .. like white-cream ) Any suggestions are welcome!