I want to paint a couple of rooms before putting our house on the market in Spring, and would like to paint them white - but not "pure brilliant white" as both rooms are north-facing and I think it would like too cold. I know Fired Earth and Farrow and Ball do off-white paints, but they all look so dark on the colour cards that I can't imagine that they will look white on the walls. Does anyone have tips on good, non-garish, slightly warm white paints that I could try?