A stylists dream room , a blank canvas.  I often wonder about the lack of colour in a persons life and how they think.  Personally I would go insane - in fact isn't this the colour used in those wards where you wear the tight jumpers with your arms folded close together. 

I would start with some paint around those windows, maybe tangerine tango would brighten up this dull and depressing area complimented with rolls of wallpaper in a citrus colour for a burst of vitality from the end right hand wall as far as it would .  Then we start working in the furniture.  What a challenge it would be !!